Which setting controls how long a consumer holds an exclusive lock before the message becomes visible again?

1. A TimeToLive
2. ✓ B LockDuration (correct answer)
3. C MaxDeliveryCount
4. D AutoDeleteOnIdle

Shortcut: LockDuration (up to 5 minutes) is the peek-lock window. Long-running handlers should renew the lock rather than rely on a large fixed duration.