How would an administrator ensure that the command /usr/local/radius/startrad.pl was executed after each reboot?

How would an administrator ensure that the command /usr/local/radius/startrad.pl was executed after each reboot?

A.
Place the command in the /etc/sysconfig/startup.cfg file.

B.
Place the command in the /etc/rc.local file.

C.
Place the command in the /etc/rc.boot file.

D.
Copy the command to the /boot directory.