You are the desktop administrator for your company's sales department. Susan is a user in the sales department. Susan's computer currently runs Microsoft Windows NT Workstation 4. 0.  Susan uses a legacy application that is compatible with only Windows NT Workstation. You want to install Windows XP Professional on Susan's computer. You plan to set up a dual-boot configuration so that Susan can run either Windows XP Professional or Windows NT Workstation. Susan's computer has two hard disks, named drive C and drive G. You install Windows XP Professional on drive G. After Windows XP Professional is installed, Susan reports that Windows NT Workstation is no longer available. You need to ensure that both operating systems are available on Susan's computer. What should you do?（） 

• A、Insert the Windows XP Professional CD-ROM into the computer. Run the Sfc.exe /scannow command.
• B、Insert the Windows XP Professional CD-ROM into the computer. Run the Winnt32. exe /cmdcons command.
• C、Start the computer by using an MS-DOS bootable floppy disk. Run the Attrib.exe -r -h -s c：/bootsect.dos command.
• D、Start the computer by using the Windows XP Professional CD-ROM. From the Recovery console， run the Bootcfg /rebuild command.