The phone status of a user is not updating automatically during use. What is the most likely problem?

A.
The user is not associated with a line appearance.

B.
The user is not logged in to Cisco Unified Personal Communicator.

C.
SUBSCRIBE calling search space on the SIP trunk to Cisco Unified Presence is set incorrectly.

D.
The Rerouting and Out-of-Dialog Refer settings are incorrectly set to Default.