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When using a Network File System (NFS) for AEM,CachingFileDataStoreis recommended because it caches binary data on the file system and stores only references to the binaries in the repository. This can be beneficial for performance, as it reduces the latency associated with reading binaries over the network, especially when NFS is being used. The caching layer helps in optimizing read operations by keeping a local cache of frequently accessed data.

S3DataStoreis used when integrating with Amazon S3 for storage.

FileDataStoredoes not provide caching capabilities and would not be as efficient asCachingFileDataStorewhen using NFS.

In a Maven project, the<version>property is used to specify the version of the project itself. This version can include the version of the AEM project being built if that's the convention used in the project's versioning strategy. It's typically specified in thepom.xmlfile at the root of the project and is inherited by all the modules of the project unless they specify a different version locally in their respectivepom.xmlfiles.

The "Multi Resource Support" property is used in custom workflow models in AEM to allow a single workflow instance to handle multiple resources, such as assets or pages. When this property is set to true, if multiple assets or pages are selected and theworkflow is initiated, AEM will start only one workflow instance instead of individual instances for each item. This is useful for bulk processing of resources, improving efficiency, and managing workflows better.

Option B, "Multi Resource Enable," is not a standard AEM workflow property.

Option C, "Transient Workflow," refers to workflows that do not persist their data and are not related to handling multiple resources in a single instance.

A Java service, which is a backend Java class that encapsulates some business logic or functionality, should be placed in thecoreMaven module of an AEM project. This module is intended for the Java code that contains OSGi services, servlets, and other Java backend code. By creating the service in thecoremodule, it can be properly compiled, packaged, and deployed as an OSGi bundle within AEM.

In AEM, Lucene is often used for indexing due to its powerful full-text search capabilities, and it also supports asynchronous indexing. Asynchronous indexing allows the system to handle other tasks while indexing is being processed in the background, which can improve performance and scalability. This is especially useful when multiple properties need to be indexed without impacting the immediate response times of the system. Therefore, when a developer needs to enable the indexing of multiple properties asynchronously, a Lucene index is the most suitable choice.

When an AEM instance starts with specified run modes, it selects configurations from the repository that match those run modes. Run modes allow for flexible management of settings and configurations across different environments. For the instance started with 'author', 'dev', and 'emea' run modes, it would apply configurations from paths that match these run modes.

Option B,/config/author.dev.emea.noldap, is correct. This path matches all three run modes specified and would, therefore, be included.

Option D,/apps/mysite/config.author.emea.dev, is also correct. This path matches the run modes and would be applied to the instance as well.

Options A and C do not match all three run modes and therefore would not be applied.

Given the dispatcher configuration snippet provided in the image, we can understand the URL patterns that will be ignored (not cached) by the dispatcher. The configuration under/ignoreUrlParamsshows patterns to match query parameters in the URLs:

/0001 { /glob "*" /type "deny" } means that by default, all query parameters are ignored (not cached).

/0002 { /glob "search" /type "allow" } specifically allows caching for URLs with the 'search' parameter.

/0003 { /glob "order" /type "allow" } specifically allows caching for URLs with the 'order' parameter.

Based on this, let's evaluate the options:

A. /myproduct/myrecipe.html?search=searchparam — This URL will not be cached because the 'search' parameter is allowed, but the actual value 'searchparam' does not match any allow pattern. B. /myproduct/myrecipe.html?search=s&order=asc&brand=ad — This URL will not be cached because although 'search' and 'order' parameters are allowed, the 'brand' parameter is not allowed according to the configuration. C./myproduct/myrecipe.html?brand=mybrand — This URL will be cached because there are no allowed parameters, so the default deny does not apply, and the page can be cached without considering the 'brand' parameter.

Therefore, the page that will be cached on the dispatcher is the one in option C, as it does not contain any of the explicitly allowed query parameters ('search' or 'order'), and all other parameters are ignored by default.

In Sling Models, the@DefaultInjectionStrategyannotation is used to specify the strategy for injecting fields into the model. When setting it toDefaultInjectionStrategy.OPTIONAL, it indicates that all injected fields in the Sling Model are optional and the model will not fail to instantiate if a field cannot be injected. This is a class-level annotation that affects the default injection behavior of all fields within the Sling Model.

Option B is incorrect becauserequiredInjectionStrategyis not a valid annotation property in Sling Models.

Option C is incorrect becauseinjectionStrategyis not specified at the class level; it is used on the field level with the@Injectannotation.

In HTL (HTML Template Language), the syntax to manipulate the URI path does not provide direct methods for removing selectors. However, within Sling and HTL, the Link Handler can be extended to support such operations. For out-of-the-box HTL, the proper approach to manipulate the link would be done in the Java layer (e.g., a Sling Model or a Use-Class in HTL), and then passed to the template for rendering. Nevertheless, if such a functionality were to be implemented within HTL, it would require custom code and not use the indicated syntax options. It is important to note that options A and B with 'removeSelectors' are not standard HTL syntax.

In an AEM Single Page Application (SPA) project, the.model.jsonendpoint is used to expose the properties of a Sling Model as JSON. This is useful for SPAs that need to access component properties dynamically. The front-end developer should check the URL[homepage-path]/model.jsonto see the JSON output of the Sling Model for the new component. This endpoint provides a tree of the page content as JSON, which includes the Sling Model's exported properties for components included on the page.