Which two of these statements are true of SSL handshake protocol?

Handshake protocol is the most complex part of SSL. Which two of these statements are true of SSL handshake protocol? (Choose two)

A.
This protocol allows the server and client t o authenticate each other.

B.
This protocol is used after any application data is transmitted.

C.
This is not a single protocol but rather two layers of protocol

D.
This protocol is used to exchange cryptographic keys using DH

E.
This protocol consists of a series of message exchanged by t he client and server.