单项选择题
Review the following program.
What is the possible problem？（）
A.#!/bin/ksh line is missing
B.Variable name VAR is not properly initialized
C.Loop variable is not incremented inside the loop
D.Loop variable is not decremented inside the loop
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Asystemadministratorhasaserverthatisperformingpoorly.ThevmstatcommandidentifiesthathighCPUusageistheproblem.Whichofthefollowingcommandscanbeusedtoidentifytheeightmostactiveprocessesrunningontheserver？（）
A.ps -ef -t8
B.sar -u -p 8
C.vmstat -t 8
D.topas -p8 -n0 -d0 -
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Asystemadministratorisunabletounmountafilesystem.Whichistheappropriatecommandtodeterminewhoorwhatisaccessingthefilesystem？（）
A.who /filesystem
B.lsfs /filesystem
C.fuser /filesystem
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Asystemadministratorwantstoconfigureasystemsothatallnewuserswillbeputintothedatabasegroupbydefault.Howwouldthisbeaccomplished？（）
A.remove all other groups from the system
B.run the command mkuser -default "GROUP=database"
C.change the default group in /usr/lib/security/mkuser.default
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