Your network includes Microsoft Hyper-V Server 2008 R2 servers. Each Hyper-V server runs multiple virtual machines （VMs）. The VM guest operating systems include Windows Server 2003 and Windows Server 2008 R2. You are analyzing VM performance metrics to complete capacity planning for the Hyper-V servers. The performance metrics for the VMs are shown in the following table. You need to identify the VM that is showing indications of reduced performance. Which VM should you choose？（）

• A、virtual machine B
• B、virtual machine A
• C、virtual machine D
• D、virtual machine C