In Cisco Unified Communications Manager presence with SIP, if the presence entity resides within the Cisco Unified Communications Manager cluster, how does Cisco Unified Communications Manager respond to a SIP line-side presence request?
A . by sending a SIP NOTIFY message to the presence watcher to indicate the current status of the presence entity
B . by sending a SIP SUBSCRIBE message to the presence watcher to request the presence status of the indicated presence entity
C . by sending SCCP messages to the presence watcher to indicate the current status of the presence entity
D . by using the Cisco Unified Presence PUBLISH Trunk service parameter on Cisco Unified Communications Manager to associate the user with a line appearance
Answer: A