Which of the following statement is not correct with reference to cron daemon…

Answer: The statement "Crontab for individual users are not stored." is not correct.

Reason: Cron maintains per-user crontab files and system crontabs, so individual user crontabs are indeed stored and read by the cron daemon.

• "The cron daemon is the standard tool for running commands on a pre-determined schedule." — Correct. Cron is the typical scheduler used for this purpose.

• "It starts when the system boots and runs as long as the system is up." — Generally correct. Cron is started during system initialization (for example via systemd or init) and runs while the system is up.

• "Cron reads configuration files that contain list of command lines and the times at which they invoked." — Correct. Cron reads crontab files that map schedule fields to command lines.

• "Crontab for individual users are not stored." — Incorrect. User crontabs are stored (commonly under /var/spool/cron or /var/spool/cron/crontabs) and can be edited with the crontab command; the cron daemon reads these files.

Additional note: System-wide crontab files (for example /etc/crontab) and per-user crontabs both coexist; the cron daemon consults these when scheduling jobs.