Which two statements are correct about the aaa authentication login default grouptacacs+ localglobal configuration command？ （）
- A this login authenticationmethod list is automaticallyapplied to all lines except those that have a named method list explicitly defined
- B If the user fails the TACACS+ authentication then the local database on the router will be used to authenticatethe user
- C if the tacacs+ server fails to respond then the local database on the router will be used to authenticate the user
- D "login" is the name of the method list being configured
- E if the tacacs+ server is unavailable， authentication will succeed automaticallyby default