Your Windows 2000 Professional computer has a single Pentium II 400-Mhz processor, 64 MB of RAM,and E-IDE hard disk. You use your computer to design graphics ads for web sites and newspapers. When you are working on multiple ads simultaneously, you notice that your computer responds very slowly. You are also experiencing long delays when loading color palettes and importing graphics. You use system monitor to view your system performance as shown in the exhibit. You want to improve the performance of your computer based on the performance results. What should you do?（　）

• A、Increase the physical RAM in the computer to 128 MB
• B、Increase the processor priority level for your development application
• C、Add a second Pentium II 400-MHz processor
• D、Upgrade the hard disk to a SCSI-based hard disk