Which of these reasons can cause intrasite calls within a Cisco Unified Communications Manager cluster to fail?

Which of these reasons can cause intrasite calls within a Cisco Unified Communications Manager cluster to fail?
A .  The route partition that is configured in the CCD requesting service is not listed in the calling phone CS
C .  The trunk CSS does not include the partition for the called directory number.
D .  The MGCP gateway is not registered.
E .  The calling phone does not have the correct CSS configured.
F .  The calling phone does not have the correct partition configured.

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Answer: D