You have a Virtual Hard Disk (VHD) and a computer that runs Windows 7. The VHD has Windows 7installed. You need to start the computer from the VHD.  What should you do?（）

• A、From Diskpart.exe， run Select vdisk.
• B、From Disk Management， modify the active partition.
• C、Run Bootcfg.exe and specify the /default parameter.
• D、Run Bcdedit.exe and modify the Windows Boot Manager settings.