A router has been configured with the settings shown below: [edit] user@host# show system authentication-order authentication-order [ radius tacplus ]; The router also has a local database that contains the user lab with password lab123. What would happen if both the RADIUS and the TACACS servers are not accessible?（）

• A、The user lab will not be able to login.
• B、The user lab will be authenticated against the local database and will be able to login.
• C、The user lab will receive an error message indicating the router is unable to authenticate due to the authentication servers not responding.
• D、The user will be able to login only if tries to login as the root user.