When you configure TEHO for long-distance calls and use the local PSTN gateways as fallback, how many route patterns do you require for a cluster with five sites that are located in different area codes?

How are Cisco IP Phones directly configured to utilize local route groups?
A. with Cisco Unified Communications Manager device pools
B. with Cisco Unified Communications Manager CSS and partitions
C. with Cisco Unified Communications Manager regions
D. with Cisco Unified Communications Manager locations
E. with Cisco Unified Communications Manager AAR