Which of the following statements is true? (Choose all that apply.)
a. If /etc/at.allow exists, only users listed in it can use the at command.
b. If /etc/cron.allow exists, only users listed in it can use the cron command.
c. If /etc/cron.deny exists and /etc/cron.allow does not exist, any user not listed in /etc/cron.deny can use the cron command.
d. If /etc/cron.allow and /etc/cron.deny exist, only users listed in the former can use the cron command, and any users listed in the latter are denied access to the cron command.
e. If a user is listed in both /etc/cron.allow and /etc/cron.deny, then /etc/cron.deny takes precedence and the user cannot access the crontab command.
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