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单项选择题Which procedure should be used to configure the system to prevent all users from using the ‘at’ command?（）

A、Create a /var/adm/cron/at.allow file with no entries

B、Create a /var/adm/cron/at.deny file with '*' as the only entry

C、Create a /var/adm/at/at.deny file with 'ALL' as the only entry

D、Create a /var/adm/at/at.allow file with 'NONE' as the only entry

  • A

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