In order to determine how efficiently an application is reading and writing data， which of the following utilities will report read and write sizes on disk I/O requests？（）

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.

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WhichtoolisbasedontheAIXtracefacility？（）

A. no
B. netpmon
C. entstat
D. nfso

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