单项选择题
An administrator performs an audit on the /usr filesystem and finds the following permissions： -rwsr-xr-x 1 root sys 514288 Jun 18 09：40 /usr/local/bin/nmon Which of the following methods can the administrator use to remove a potential security risk（）
A.rm /usr/local/bin/nmon
B.chmod u-s /usr/local/bin/nmon
C.Reinstall the file from the appropriate fileset
D.chmod go-rx /usr/local/bin/nmon
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ASystempadministratorsuspectstheyarereceivinganerrorfromoneoftheirnightlycronjobs.Thejobis：01***/usr/local/bin/nightlycheck.plWhereshouldtheadministratorfirstlookforerrorsreportedbythiscronjob（）
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