What do you need to do before anend point can use a gatekeeper for placing orreceiving Calls? Select exactly 1 answer(s) from the following:

A.
You must first register the end point with the gateway.

B.
Ping the gatekeeper from theendpoint.

C.
Register the endpoint with the gatekeeper.

D.
Receive a call from anotherendpoint, which is registered with the gatekeeper.