A.Up to three external authentication server types can be used simultaneously.
B.Only one external authentication server type can be used simultaneously.
C.If the local password database is not configured in the authentication order， and the configured authentication server is unreachable， authentication is not performed.
D.If the local password database is not configured in the authentication order， and the configured authentication server rejects the authentication request， authentication is not performed

A.show access firewall-authentication
B.show security firewall-authentication users
C.show security audit log
D.show security firewall-authentication history