Which option allows for user presence information to be shared between clusters?

A.
multiple Cisco Unified Communications Manager clusters connected via a single Cisco Unified Presence cluster

B.
intercluster peers between Cisco Unified Presence clusters connected via a single Cisco Unified Communications Manager cluster

C.
Cisco Unified Personal Communicator logged into multiple Cisco Unified Presence clusters

D.
intercluster peers between Cisco Unified Presence clusters