单项选择题

Ithasbeendeterminedthatprintjobsfromanapplicationarenotbeingremovedfromthesystemaftertheyhavebeenprinted.Toremovethesejobsfromthe／var／spooldirectory,whichcronentrywillremovefilesmorethan7daysold?（）

A.find/var/spool/lpd/qdir-mtime-7-typef-execrm-f{}/
B.find-name/var/spool/*-frm{}/
C.find-name/var/spool/lpd/*-execrm{}/
D.find/var/spool/lpd/qdir-mtime+7-typef-execrm-f{}/

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