Which option describes the recommended way to configure redundant Cisco Unified Communications Manager subscribers for Cisco IP phone registration in a single cluster for the Cisco Unified Contact Center Enterprise solution?

Which option describes the recommended way to configure redundant Cisco Unified Communications Manager subscribers for Cisco IP phone registration in a single cluster for the Cisco Unified Contact Center Enterprise solution?
A . Add a redundant device pool to the Cisco Unified CallManager Group configuration.
B . Add a second TFTP server to the cluster.
C . Add an additional Cisco Unified Communications Manager subscriber to the Cisco Unified Communications Manager Group defined in device pool of the Cisco IP Phone.
D . Use an SRST reference in the device pool.

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Answer: C