You have a user whose account you want to disable but not remove. What should you do?
A. Edit /etc/gshadow and just remove his name.
B. Edit /etc/passwd and change all numbers to 0.
C. Edit /etc/shadow file and remove the last field.
D. Edit /etc/passwd and insert an * after the first :.
E. Edit /etc/group file and put a # sign in front of his name.