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