You are a network administrator for your company. All servers run Windows Server 2003. A server named Server1 functions as an application server. Server1 runs several applications. Server1 is located on the company's perimeter network. You allow communication to Server1 only over port 80. Users report that applications on Server1 perform poorly during periods of peak activity. You monitor Server1. The results are shown in the exhibit. (Click the Exhibit button.) You need to identify which process is causing Server1 to perform poorly. Which two tools can you use to achieve this goal? （）(Each correct answer presents a complete solution. Choose two.)

• A、Event Viewer
• B、Task Manager
• C、Network Monitor
• D、System Monitor