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单选题
An administrator attempted to run a sar -u report and received the following error： sar： 0551-201 Cannot open /var/adm/sa/sa12. Which of the following should be scheduled in adm’s crontab to enable sar reporting（）
A
sar
B
sa1
C
vmo
D
iostat
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考题
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考题
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考题
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