When a Cisco Unified Communications Manager group has its primary, secondary, and tertiary servers changed, how are thos

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When a Cisco Unified Communications Manager group has its primary, secondary, and tertiary servers changed, how are those changes propagated to the IP phones registered to the group?

A. The IP phones will automatically register with the new primary server.
B. The IP phones will need to be reset so that a new configuration file can be downloaded from the TFTP server.
C. The primary Cisco Unified Communications Manager server automatically pushes a new configuration file to the IP phones in the affected device pool.
D. The device pools will need to be edited so that the new Cisco Unified Communications Manager group information is applied to the appropriate device pools.