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