Which of the following crontab entries could be used to set the system time at regular intervals?

Which of the following crontab entries could be used to set the system time at regular intervals?

A.
1 0 * * * date $d $t $24

B.
1 0 * * * settime $d $t $24

C.
1 0 * * * date<ntp1.digex.net

D.
1 0 * * * /usr/sbin/runcron date <ntp1.digex.net

E.
1 0 * * * /usr/sbin/ntpdate ntp1.digex.net > /dev/null 2>&1