Which crontab entry could be used to set the system time at regular intervals?

Which crontab entry could be used to set the system time at regular intervals?

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

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

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

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

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