What are the characteristics of a Cisco Unified Communications Manager group?

What are the characteristics of a Cisco Unified Communications Manager group?
A . Each call-processing server can be assigned to a single Cisco Unified Communications Manager group.
B . A Cisco Unified Communications Manager group is a prioritized list of (one or more) callprocessing and application servers.
C . Each device has to have a Cisco Unified Communications Manager group assigned, which will determine the primary and backup servers to which it can register.
D . A single Cisco Unified Communications Manager group can exist in a single cluster.

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Answer: B