You want the text "Unauthorized access prohibited!" to be displayed before the login prompt every time someone tries to initiate a Telnet session to a router, as shown in the example below: Which command can be used to configure this message?（）
- A login banner x Unauthorized access prohibited! X
- B banner exec y Unauthorized access prohibited! Y
- C banner motd x Unauthorized access prohibited! X
- D vtv motd "Unauthorized access prohibited!"