Platform Events follow an event-driven architecture that allows for seamless integration between internal Salesforce processes and external applications. Once an event is defined, it must be "published" to the event bus to be seen by subscribers.
External Applications (Option C) publish platform events by using the Salesforce REST, SOAP, or Pub/Sub APIs. Essentially, an external app "inserts" a record into the event object (e.g., Order_Event__e). Since platform events are treated as a special type of Salesforce object, the standard API create call acts as the publishing mechanism.
Option A is incorrect because the Streaming API is used for subscribing to events, not for publishing them. Option B is incorrect because Outbound Messages are a legacy SOAP-based notification tool and do not publish platform events. Option D is incorrect because Entitlement Processes are service-level management tools and are not part of the event-driven architecture.
For internal apps, platform events can also be published via Apex (using EventBus.publish()) or declaratively using Flow Builder. The key takeaway for external integration is that publishing is handled via standard Salesforce APIs, making it accessible to any system capable of making an HTTP request.
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