What action should be taken to unlock a user account that has been locked?

To unlock a user account that has been locked, utilizing the "Unlock Account" function is the most direct and appropriate action. This function is specifically designed to address situations where accounts have been temporarily disabled due to multiple failed login attempts or other security triggers. By using this option, the administrator can restore access to the user account without altering the user’s password or changing account settings unnecessarily.

Resetting the password, while it may restore access, is not the primary method intended for unlocking an account and could lead to confusion for the user if they had a specific password they want to retain. Disabling the account would prevent access altogether rather than restore it. Enabling an account is only relevant if the account had been previously disabled, which is not the same as being locked due to security protocols. Therefore, using the designated "Unlock Account" function directly addresses the problem of a locked account, making it the ideal solution.