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?

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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?
A . 15 when not using a local route group
B . 6 when using a local route group
C . 5 when using a local route group
D . 10 when not using a local route group

Answer: B