Which Cisco Unified Communications Manager configuration causes an IP phone screen to display a "registration rejected" message?

Which Cisco Unified Communications Manager configuration causes an IP phone screen to display a "registration rejected" message?
A . Cisco Unified Communications Manager is unable to reach user IP phone.
B . Cisco Unified Communications Manager database replication status is 2.
C . Cisco Unified Communications Manager auto registration is disabled.
D . Cisco Unified Communications Manager is unable to allocate D
F . Cisco Unified Communications Manager subscriber is offline.

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Answer: D