How are E.164 called-party numbers normalized on a globalized call-routing environment is Cisco Unified Communications Manger?

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

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Answer: A