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单项选择题 To examine the Exhibit， press the Exhibit button. While a user 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 I/O bottleneck？（）

A、 The bottleneck is network I/O.

B、 The bottleneck is local disk I/O.

C、 The bottleneck is paging space I/O.

D、 The bottleneck is to a remote filesystem.

  • B

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