Refer to topology and Exhibits below:
What is the reason that this MGCP gateway is not registered with Cisco Unified Communications Manager?
A . The primary server address is incorrect.
B . The MGCP domain name is incorrect on either the Cisco Unified Communications Manager or the router.
C . Backhaul/Redundant link port is incorrect
D . This MGCP gateway is not down; it is operational.
Answer: B