What is required for Cisco UCM to accept SIP calls with a URI in the format of ‘sip:[email protected]’?

What is required for Cisco UCM to accept SIP calls with a URI in the format of ‘sip:[email protected]’?
A . Define Cluster Fully Qualified Domain Name under Servers in Cisco UCM.
B . Change the Destination Address to a Fully Qualified Domain Name on the SIP trunk.
C . Define Cluster Fully Qualified Domain Name in Enterprise Parameters.
D . Set the SIPS URI Handling to True in CallManager Service Parameters.

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Answer: C