The chage command can be used to change the expiration date of a user account. By setting the expiration date to a past date, the user account will be disabled and the user will not be able to login interactively. This is a temporary method, as the expiration date can be changed back to a future date or removed to re-enable the user account. The other options are either permanent, insecure, or ineffective. Option A is insecure, as it allows anyone to login as the user without a password. Option C is permanent, as it changes the user's password without saving the original one. Option D is ineffective, as it only affects the user's .login file, which is used by the csh and tcsh shells, and not by other shells such as bash or zsh. Therefore, option B is the best method to temporarily suspend a user's ability to interactively login. Reference: https://linuxconfig.org/disabling-user-logins-to-linux-system
https://askubuntu.com/questions/282806/how-to-enable-or-disable-a-user