How should this be accomplished?

An administrator is asked to configure egress call routing by applying globalization and localization on Cisco UCM .

How should this be accomplished?
A . Localize the calling and called numbers to PSTN format and globalize the calling and called numbers in the gateway.
B . Globalize the calling and called numbers to PSTN format and localize the calling number in the gateway.
C . Localize the calling and called numbers to
D . 164 format and globalize the called number in the gateway.
E . Globalize the calling and called numbers to
F . 164 format and localize the called number in the gateway.

Answer: D