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、A. Replace the hard disk with a faster disk drive.
B、B. Add another paging space on another hdisk.
C、C. Spread the data hdisk0 across several hdisks.
D、D. Nothing, since %iowait is a measurement of CPU time.