A Service Bus consumer calls ReceiveMessageAsync with a MaxWaitTime of 5 seconds but no message is available. What is returned?

1. A Exception is thrown
2. ✓ B null (no message available) (correct answer)
3. C An empty message
4. D The call blocks indefinitely

Shortcut: ReceiveMessageAsync returns null when no message arrives within MaxWaitTime. Applications should check for null before processing to handle empty queue scenarios gracefully.