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.
