An administrator has a user whose account needs to be disabled but not removed. Which of the following should the administrator do?

		Edit /etc/gshadow and just remove the user name. and just remove the user? name.
		Edit /etc/passwd and change all numbers to 0.
		Edit /etc/shadow and remove the last field.
		Edit /etc/passwd and insert an * after the first : .
		Edit /etc/group file and put a # sign in front of the user name. sign in front of the user? name.