Which of the following statements about the cron daemon in a UNIX operating system is NOT correct?

1. A(A) cron is the standard tool for running commands on a predetermined schedule.
2. B(B) It starts when the system boots and keeps running as long as the system stays up.
3. C(C) cron reads configuration files (crontabs) that list command lines together with the times at which they should be invoked.
4. D(D) Crontabs for individual users are not stored.

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