Which configuration concept allows for high-availability on IM and Presence services in a UC environment?

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Which configuration concept allows for high-availability on IM and Presence services in a UC environment?
A . IM and Presence subclusters (configured on Cisco UCM)
B. Presence Redundancy Groups (configured on Cisco Unified IM and Presence)
C. IM and Presence subclusters (configured on Cisco Unified IM and Presence)
D. Presence Redundancy Groups (configured on Cisco UCM)

Answer: D