Which of the following actions prevents a specific user from scheduling tasks using at or batch?

A. Add the specific user to the /etc/at.allow file.

B. Add the specific user to the [deny] section in the /etc/atd.conf file.

C. Add the specific user to the /etc/at.deny file.

D. Add the specific user to the nojobs group.

E. Run atd –deny followed by the name of the specific user.