【单项选择题】
Because of system performance problems， a system administrator ran the iostat command. The following iostat output is provided：<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/20180802115656804.jpg" /><br /> Which of the following issues can be derived from the output？（）<p> Because of system performance problems， a system administrator ran the iostat command. The following iostat output is provided：<br /> <img src="https://img.ppkao.com/2018-08/zhoulian/20180802115656804.jpg" /><br /> Which of the following issues can be derived from the output？（）</p>
A、A.The server is CPU bound.
B、B.The server has network problems.
C、C.The server is memory constrained.
D、D.The server needs the disk usage to be optimized.X
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