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?()<br /> <img src="https://nimg.ppkao.com/2018-08/tianmin/2018080211553729924.jpg?sign=8afb6c2837fd1a57f074d0bd9d44c26f&t=62d02058" />
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.