Which two issues are possible causes of this problem?

You have received a trouble ticket stating that an IP phone is not working. When asked, the user informs you the phone is displaying the message “Registration rejected.” Which two issues are possible causes of this problem? (Choose two.)
A. The IP phone is not getting an IP address.
B. The IP phone’s primary Cisco Unified CallManager has a database replication issue.
C. The primary Cisco Unified CallManager is unavailable and the CallManager group assigned to the IP phone does not include a secondary CallManager.
D. The IP phone has not been defined in Cisco Unified CallManager.
E. The IP phone is not associated with a valid user profile.

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