Which TWO statements about crontab are true?

Which TWO statements about crontab are true?

A.
Every user may have their owncrontab.

B.
Changing a crontab requires a reload/restart of the cron daemon.

C.
The cron daemon reloads crontab files automatically when necessary.

D.
hourly is the same as “0 * * * *”.

E.
A cron daemon must run for each existing crontab.