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

• A、A good security practice is to havethe none parameter configured as the final method used toensure 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 beable 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 modeas long as the proper enable password is entered
• D、Theaaa new-model command forces the router to override every other authentication methodpreviously 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 displayedaaa authentication command