To Prevent a Specific User from Scheduling Tasks with At

Multiple Choice

To prevent a specific user from scheduling tasks with at, what should the administrator do?

A) Add the specific user to /etc/at.allow file.
B) Add the specific user to [deny] section in the /etc/atd.conf file.
C) Add the specific user to /etc/at.deny file.
D) Add the specific user to nojobs group.
E) Run the following: atd --deny [user].