When retrieving a message from Avaya Aura® Messenger (AAM), what is the function of the REINVITE?

When retrieving a message from Avaya Aura® Messenger (AAM), what is the function of the REINVITE?
A . The RE-INVITE is only used when the initial INVITE is not transmitted successfully.
B . The RE-INVITE shuffles the media path off Avaya Aura® Communication Manager (CM).
C . The RE-INVITE is to allow the user to be authenticated.
D . The RE-INVITE is only sent if a voice port cannot be initially connected to the caller.

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Answer: C