Which two statements about endpoint registration authentication are true? (Choose two.)

Which two statements about endpoint registration authentication are true? (Choose two.)
A . Authentication credentials can be stored in the local database of the Expressway.
B . SIP endpoints always need authentication credentials.
C . The endpoint and Expressway must be configured and synchronized with an NTP server delivering an identical time stamp.
D . Expressways and endpoints do not need to be synchronized with identical NTP timestamps.
E . When a subzone is set for "Treat as Authenticated", the endpoint must have the correct authentications configured.

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Answer: AC