You want to change the aging information in the /etc/shadow file. What is the best utility to use to do this?

A.
vi

B.
emacs

C.
usermod

D.
modinfo

E.
chage

Explanation:
From the man pages:
The chage command changes the number of days between password changes and the date of the last password change. This information is used by the system to determine when a user must change his/her password.