The SSH Agent installation method supports which authentication mode(s)?

A.
Only password protected logins only can be configured, by using ssh-keygen.

B.
Either password protected or passwordless logins can be configured, by using ssh-keygen.

C.
Only passwordless logins can be configured, by using ssh-keygen.

D.
Either password protected or passwordless logins can be configured by changing the Agent config
file.