A is correct.
line con 0 already has a password, so it needs the "login" command added to the config to force you to enter a password when logging into the router console.
" la commande login permet de configurer le routeur pour qu'il exige une authentification à l'ouverture de session. Lorsque la connexion est activée et qu'un mot de passe est défini, l'utilisateur de la console est invité à saisir un mot de passe avant d'accéder à la CLI."
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masrur
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