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单选题
It has been determined that print jobs from an application are not being removed from the system after they have been printed. To remove these jobs from the /var/spool directory, which cron entry will remove files more than 7 days old?()
A

 find /var/spool/lpd/qdir -mtime -7 -type f -exec rm -f {}/

B

 find -name /var/spool/* -f rm {}/

C

 find -name /var/spool/lpd/* -exec rm {}/

D

 find /var/spool/lpd/qdir -mtime +7 -type f -exec rm -f {}/


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