FILL BLANK - Which file, if present, must contain all users that are allowed to use the cron scheduling system? (Specify the full name of the file, including path.)
The correct answer is /etc/cron.allow.
If the /etc/cron.allow file is present, then only users listed in that file are allowed to use the cron scheduling system. This file is typically used to restrict cron access to root and other privileged users. If the /etc/cron.allow file does not exist, then all users are allowed to use cron.
/etc/cron.allow is correct
man crontab
DESCRIPTION
crontab is the program used to install, deinstall or list the tables used to drive the cron(8) daemon in Vixie Cron. Each user can have their own crontab, and though these are files in /var/spool/cron/crontabs, they are not
intended to be edited directly.
If the /etc/cron.allow file exists, then you must be listed (one user per line) therein in order to be allowed to use this command. If the /etc/cron.allow file does not exist but the /etc/cron.deny file does exist, then you
must not be listed in the /etc/cron.deny file in order to use this command.
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