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.