Refer to the exhibit.

Which trunks would be most suitable for Connection Y?

A.
an H.225 trunk (gatekeeper-controlled)

B.
intercluster trunk (gatekeeper-controlled)

C.
a SIP trunk on the U.S. cluster and an intercluster trunk on the remote cluster

D.
intercluster trunk (nongatekeeper-controlled)

E.
No extra connections are required. As long as IP connectivity exists, you need only configure a route pattern for each site. The Cisco Unified Communications Manager will automatically forward the calls over the WAN if the destination directory number is not registered locally.

Explanation: