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 . Set the SIPS URI Handling to True in CallManager Service Parameters.
B . Define Cluster Fully Qualified Domain Name in Enterprise Parameters.
C . Change the Destination Address to a Fully Qualified Domain Name on the SIP trunk.
D . Define Cluster Fully Qualified Domain Name under Servers in Cisco UC

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Answer: B