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.