Question: Upon successful deletion of an MBS User Service, what HTTP status code does the Network Exposure Function (NEF) return in its `Nnef_MBSUserService_Delete` response to the Application Function (AF)?
Option 1: HTTP "200 OK" with the deleted resource details
Option 2: HTTP "204 No Content"
Option 3: HTTP "202 Accepted" with a pending deletion status
Option 4: HTTP "404 Not Found" indicating the service is removed
Explanation: The correct answer is Option 2 because, according to standard practices in HTTP and as described in the context of telecom network operations for such services, a "204 No Content" status code is typically returned when a request has been successfully processed, and there is no additional content to return in the response body, which aligns with the outcome of a successful deletion operation. This response indicates that the action requested by the AF (deletion of an MBS User Service) was executed without error, but there’s no need for additional information in the response.