Refer to the exhibit. Which configuration enables fallback to local authentication and authorization when no TACACS+ server is available?

The `aaa fallback local` command is not a standard Cisco IOS command for configuring AAA authentication fallback in this context.

The `aaa authentication login FALLBACK local` command defines a new method list named 'FALLBACK' but does not combine TACACS+ with local authentication in the correct syntax for fallback.

The `aaa authentication login default local` command would configure only local authentication as the default, without attempting TACACS+ first or providing an explicit fallback mechanism in the desired order.

The `aaa authentication login default group tacacs+ local` command creates a default login method list, specifying that authentication should first attempt to use a TACACS+ server group, and if that fails, it should then fall back to local authentication.