Refer to the exhibit. Which two statements about the AAA configuration are true?（）

A.A good security practice is to have the none parameter configured as the final method used to ensure that no other authentication method will be used.
B.If a TACACS+ server is not available， then a user connecting via the console port would not be able to gain access since no other authentication method has been defined.
C.If a TACACS+ server is not available， then the user Bob could be able to enter privileged mode as long as the proper enable password is entered.
D.The aaa new-model command forces the router to override every other authentication method previously configured for the router lines.
E.To increase security， group radius should be used instead of group tacacs+.
F.Two authentication options are prescribed by the displayed aaa authentication command.