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单选题
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
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