How would this be accomplished?

A Linux administrator wants to disable the use of setuid and setgid files for the /var file system.
How would this be accomplished?

A.
Add an entry to the options list in /etc/fstab

B.
Add an entry to /etc/setuid.conf

C.
Run the command "tune2fs –nosuid /var"

D.
Add an entry to the options list in /etc/sysctl.conf