In case neither cron.allow nor cron.deny exist in /etc/, which of the following is true?

In case neither cron.allow nor cron.deny exist in /etc/, which of the following is true?
A .  Without additional configuration, no users may have user specific crontabs.
B .  Without additional configuration, all users may have user specific crontabs.
C .  The cron daemon will refuse to start and report missing files in the system’s logfile.
D .  When a user creates a user specific crontab the system administrator must approve it explicitly.

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Answer: A