You are the administrator of ExamSheet.net'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 want to determine if the performance problems are being caused by a memory bottleneck. What should you do?（）

• A、Use Task Manager to view the running applications. 
• B、Use Task Manager to view the running processes.
• C、Use System Monitor to view the System-Processor Queue Length and Processor-Interrups/Sec counters.
• D、Use System Monitor to view the Logical Disk-Avg. Disk sec/Transfer and Memory-Pages/Sec counters.