单项选择题
A system administrator has run topas on a server. The output shows that the %iowait of the system is 60% and that most of the disk activity is on hdisk0. Which of the following procedures should be performed to fix this problem?（）
A. Replace the hard disk with a faster disk drive.
B. Add another paging space on another hdisk.
C. Spread the data hdisk0 across several hdisks.
D. Nothing, since %iowait is a measurement of CPU time.
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