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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?()

A. There is a file I/O bottleneck.
B. There are too many open files. 
C. There appears to be a buffer shortage. 
D. There is a paging space I/O bottleneck. 

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