Question: Upon successful deletion of a Media Streaming Event Exposure Subscription, what HTTP status code does the Network Exposure Function (NEF) return in the `Nnef_MSEventExposure_Unsubscribe` response message to the Application Function (AF)?
Option 1: HTTP "200 OK" with the deleted resource details
Option 2: HTTP "202 Accepted" indicating asynchronous processing
Option 3: HTTP "404 Not Found" since the resource is deleted
Option 4: HTTP "204 No Content" indicating successful deletion without returning content
Explanation: The correct answer is Option 4 because, according to standard HTTP semantics, a "204 No Content" status code is returned when a request has been successfully processed, but there is no content to return in the response body, which is typical for delete operations where the resource no longer exists after the operation.