The question is asking about the authentication method list and what methods are valid. Line refers to the configuration of the relevant "line" (console, aux, vty, etc) where the authentication method list will be applied and not to the method being applied to the authentication method list
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_aaa/configuration/15-sy/sec-usr-aaa-15-sy-book/sec-cfg-authentifcn.html#GUID-B6D7796C-56F3-46A5-8FF4-0F625D8FBCE8
Line: Uses the line password for authentication.
Enable: Uses the enable password for authentication.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/sec_usr_aaa/configuration/15-sy/sec-usr-aaa-15-sy-book/sec-cfg-authentifcn.html
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