Which of the following crontab entries will execute myscript at 30 minutes past every hour on Sundays?

Which of the following crontab entries will execute myscript at 30 minutes past every hour on
Sundays?

A.
0 * * * 30 myscript

B.
30 * * * 6 myscript

C.
30 0 * * 0 myscript

D.
30 0-23 * * 0 myscript

E.
0 0-23 * * 30 myscript

Explanation: