How does PEAP protect EAP exchange?

A.
it encrypts the exchange using the client certificate.

B.
it validates the server-supplied certificate and then encrypts the exchange using the client
certificate

C.
it encrypts the exchange using the server certificate

D.
it validates the client-supplied certificate and then encrypts the exchange using the server
certificate.

Explanation:
The client certificate is not used for encryption with PEAP.