What Is the Purpose of a Transform in the Expressway

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

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