What does SSH require to authenticate the switch to the SSH client and set up a secure session?

Managers log in to an ArubaOS switch with SSH.

What does SSH require to authenticate the switch to the SSH client and set up a secure session?
A . an SSH authorized user key, managed by the ip ssh public-key commands
B . a username and password set with the password manager command
C . an SSH key, managed by the crypto key ss commands.
D . a self-signed certificate configured with the crypto key commands

Answer: B