Refer to the exhibit.
In order for the Instant Messaging feature in Cisco Unified Presence to function, which service is specific to the feature and required to be activated?
A. Cisco UP Sync Agent
B. Cisco UP XCP Message Archiver
C. Cisco UP XCP Authentication Service
D. Cisco UP XCP XMPP Federation Connection Manager
E. Cisco UP XCP Text Conference Manager
F. Cisco UP XCP Web Connection Manager
