On an Ubuntu server, you must create a new user called "deploy" that will authenticate only with an SSH public key and must never accept a password for login. When you run the adduser command, which single option fulfills this requirement?
--disabled-login
--disabled-password
--no-create-home
--system
The --disabled-password option tells adduser to create the account without setting a usable password. The password field in /etc/shadow is marked so that password-based authentication is impossible, but the account itself is not locked, allowing other authentication mechanisms such as SSH key-based logins. Using --disabled-login would lock the account entirely until a password is set, --system would create a system account (and still disable logins by default), and --no-create-home only affects whether a home directory is created and has no impact on authentication.
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