单选题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.
单选题
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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