You are the administrator of Company’s network.  Your Windows 2000 Professional computer has a Pentium II 400-HHz processor, 128 MB of RAM, and IDE hard disk. After installing a new digital imaging application you notice that your computer is responding very slowly and you are experiencing delays in processing graphics files. You use System Monitor to view your computer’s performance as shown in the Performance window. What should you do? （）

• A、Lower the Processor Priority level for all applications except the digital imaging application.
• B、Replace the CPU with a faster performance processor.
• C、Install a second hard disk. Move the paging file to the new hard disk.
• D、Increase the physical RAM in the computer to 256 MB or more.
• E、Install a new disk drive controller.