How is automatic fallback enabled on a Cisco IM and Presence server?

How is automatic fallback enabled on a Cisco IM and Presence server?
A . In IM and Presence Service Parameter Configuration > Cisco Server Recovery Manager, change the Failover parameter to True.
B. In Communications Manager Service Parameter Configuration > Cisco Server Recovery Manager, change the Enable Automatic Fallback parameter to True.
C. Automatic fallback is enabled by default.
D. In the Presence Redundancy Group Configuration > Cisco Unified Communications Manager, check the Enable Automatic Fallback parameter.

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Answer: D