Which statement about a SUBSCRIBE calling search space is true?

Which statement about a SUBSCRIBE calling search space is true?
A . It allows MWIs to be triggered when a message is received in Cisco Unity Connection.
B . It is used on an inbound SIP trunk from Cisco Unified Communications Manager IM & Presence to route presence requests that come from the end user.
C . It is used when adding a subscriber to Cisco Unity Connection.
D . It is used within the Cisco Unified Communications Manager IM & Presence server to track status information of Cisco Jabber clients.

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Answer: B