What is the purpose of a transform in the Expressway server?

What is the purpose of a transform in the Expressway server?
A . A transform changes the audio codec when the call goes through the Expressway
B . A transform is used to route calls to a destination
C . A transform has the function as a neighbor zone in the Expressway. It creates a connection with another server
D . A transform changes an alias that matches certain criteria into another alias

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Answer: C