Which crontab entry 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 * * * /usr/sbin/runcron date <ntpl.digex.net

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

E.
1 0 * * * date<ntpl.digex.net

Explanation:
ntpdate – set the date and time via NTP

A) invalid option for date
B) settime is not a valid command
C,E) date does not get a NTP server via stdin