Question: Upon successful deletion of an 'Individual MBS Group Message Delivery' resource, what HTTP status code does the NEF send in its `Nnef_MBSGroupMsgDelivery_Delete` response to the Application Function (AF)?
Option 1: HTTP '200 OK' with a success message
Option 2: HTTP '204 No Content'
Option 3: HTTP '202 Accepted' for asynchronous processing
Option 4: HTTP '201 Created' indicating a new resource
Explanation: When the NEF successfully deletes the requested resource and there is no content to return, it responds with an HTTP '204 No Content' status code. This indicates that the server has fulfilled the request but does not need to return an entity-body (e.g., no content). In this context, since the operation was a deletion, there's no new or updated content to provide in the response body, making '204 No Content' the appropriate response.