When is the supplicant considered to be clientless?

When is the supplicant considered to be clientless?

A.
when the authentication server does not have credentials to authenticate.

B.
when the authenticator is missing the dot1x guest VLAN under the port with which
the supplicant is connected.

C.
when the supplicant fails EAP-MD5 challenge with the authentication server.

D.
when the supplicant fails to respond to EAPOL messages from the authenticator.

E.
when the authenticator is missing the reauthentication timeout configuration under
the port with which the supplicant is connected.