What must an administrator configure in order for the ClearPass server to execute a RADIUS Change of Authorization (CoA) to Aruba Mobility Controllers (MCs) in a cluster?

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What must an administrator configure in order for the ClearPass server to execute a RADIUS Change of Authorization (CoA) to Aruba Mobility Controllers (MCs) in a cluster?
A . Active and Standby AAC with clustering
B . VRRP IP on each cluster member
C . IPSec High Availability (HA) between two cluster members
D . Primary and backup LMS IP addresses

Answer: C