A). It is true that every user may have their own crontab. This allows individual users to schedule tasks to be run at specific times without requiring administrative privileges1.
C). The cron daemon does indeed reload crontab files automatically when necessary. This means that after editing a crontab file, there is no need to manually restart the cron service for the changes to take effect1.
References:
* 107.2 Lesson 1 - Linux Professional Institute Certification Programs, which covers the automation of system administration tasks by scheduling jobs with cron.
* The LPIC2 Exam Prep, which provides additional information on the LPIC-2 objectives and topics
* related to crontab and cron daemon.