Your network environment includes the following elements： Two Windows Server 2008 R2 Hyper-V serversTwo VMware ESX 3.5 serversMicrosoft System Center Virtual Machine Manager （VMM） 2008 R2   You run several Windows Server 2003 virtual machines （VMs） on your ESX host servers. You need to convert the ESX VMs to Hyper-V， and you must minimize the downtime during the conversion.  What should you do？（）

• A、Run the New-V2V PowerShell cmdlet
• B、Perform a physical-to-virtual （P2V） conversion while the VMs are running
• C、Shut down the VMs， and then perform a virtual-to-virtual （V2V） conversion
• D、Shut down the VMs， and then perform a physical-to-virtual （P2V） conversion