多项选择题

A.The caller sends a challenge to the authenticator.B.T……

Which three steps are part of the PPP CHAP 3-way handshake?（）

A.The caller sends a challenge to the authenticator.
B.The authenticator sends a challenge to the caller.
C.The caller encrypts the challenge using a secret.
D.The caller sends a success message to the authenticator.
E.The authenticator encrypts the challenge using a secret.

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