You installed SSH on an older Linux server. You want to allow users to authenticate securely.
Which choice lists two actions that must occur first?

A.
A key pair must be obtained from a CA to enable authentication, then host keys must be
exchanged to enable data encryption.

B.
A key pair must be obtained from a CA to enable data encryption, then host keys must be
exchanged to enable authentication.

C.
Public keys must first be exchanged to enable data encryption, and then the systems can
exchange host keys to enable authentication without passwords.

D.
The systems must exchange host keys to enable data encryption, and individual users must
exchange public keys to enable authentication without passwords.