You are the network administrator for Test King. All network servers run Windows Server 2003. A server named TestKingSrv hosts applications for network users. TestKingSrv contains a motherboard that can support two CPUs. One CPU is currently installed. TestKingSrv has 512 MB of RAM and a single 36 - GB integrated device electronics (IDE) hard disk. It has a 10 MB Ethernet card connected to a 10/100 Mb switch. After TestKingSrv is in use for five months, network users report unacceptable response times on their applications. You open System Monitor on TestKingSrv and see the information shown in the following table. You need to improve the performance of Server 1. What should you do?（）

• A、Add an additional CPU.
• B、Add an additional 512 MB of RAM.
• C、Replace the existing hard disk with a faster one.
• D、Replace the 10-Mb Ethernet card with a 100-Mb Ethernet card.