Which of these determines the Cisco Unified Communications Manager server to which an IP phone registers?

Which of these determines the Cisco Unified Communications Manager server to which an IP phone registers?
A . The Cisco Unified Communications Manager group is configured with a Device Pool that designates the primary, secondary, and tertiary servers in the group.
B . Each IP phone is configured with a Device Pool containing the Cisco Unified Communications Manager group that determines which server the IP phone will use as its primary, secondary, and tertiary server.
C . Each IP phone is configured with its primary, secondary, and tertiary server.
D . The Cisco Unified Communications Manager group is configured in the publisher to designate the IP phone groups that will register with the primary, secondary, and tertiary servers in the group.

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Answer: B