Which of the following descriptions of server authentication is correct?

The visitor sends the username and password that identifies his identity to FW through the portal authentication page, there is no password stored on F7, FT sends the username and password to a third-party authentication server, and the verification process is carried out on the authentication server.

Visitors obtain the SMS verification code through the Portal authentication page, and then enter the SMS verification code to pass the authentication.

The visitor sends the username and password that identifies his identity to the third-party authentication server, and after the authentication is passed, the third-party authentication server sends the visitor's identity information to FW.

The visitor sends the username and password that identifies them to the FW through the portal authentication page, on which the password is stored and the verification process takes place on the FW.