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.