A user reports that when they are using Cisco Unified Personal Communicator, their status does not change when they are on the phone. What is the typical cause of this issue?

A.	The username or password is invalid.
B.	The Cisco Unified Presence account is locked out.
C.	The user is not associated with the line.
D.	Cisco Unified Presence is not enabled for the user.
E.	Cisco Unified Presence is not enabled for the line.