单项选择题

Which of the following commands will reset NFS options to their defaults？（）

A. nfso -d
B. nfso -c
C. startsrc -g nfs -d
D. startsrc -g nfs -r

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单项选择题
To examine the Exhibit， press the Exhibit button. While a developer is compiling a C program，  vmstat 120 10  is run to determine the cause of a performance problem.  Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the machine？（）

A. The machine has too many users.
B. The machine has an I/O bottleneck.
C. The machine has a CPU bottleneck.
D. The machine has a memory bottleneck.
单项选择题
Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofbytesreadonanygivendisk？（）

A. tprof
B. topas
C. filemon
D. vmstat
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