Which of the following is true about Diffie-Hellman?

Which of the following is true about Diffie-Hellman?
A . Diffie-Hellman is a key agreement protocol that enables two users or devices to authenticate each other’s preshared keys without actually sending the keys over the unsecured medium.
B . Diffie-Hellman is an encapsulation protocol that enables two users or devices to send data to each other.
C . Diffie-Hellman is a part of the RSA encryption suite.
D . Diffie-Hellman has three phases, and the second and third are used to encrypt data.

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Answer: A