How are E.164 called-party numbers normalized on a globalized call-routing environment in Cisco UCM?

How are E.164 called-party numbers normalized on a globalized call-routing environment in Cisco UCM?
A . Call ingress must be normalized before the call being routed.
B . Normalization is not required.
C . Normalization is achieved by stripping or translating the called numbers to internally used directory numbers.
D . Normalization is achieved by setting up calling search spaces and partitions at the SIP trunks for PSTN connection.

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Answer: C