Which action configures PSTN backup for calls that are rejected by the gatekeeper CAC?

Which action configures PSTN backup for calls that are rejected by the gatekeeper CAC?
A . Configure AAR in Cisco Unified Communications Manager.
B . Configure CFUR in Cisco Unified Communications Manager.
C . Configure a route pattern, a route list, and route groups to a trunk and a gateway in Cisco Unified Communications Manager.
D . Configure a route pattern to a gateway in Cisco Unified Communications Manager.

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Answer: C