A user has a computer that runs Windows 2000 Professional. The user plans to upgrade the computer to Windows XP Professional. You need to instruct the user how to perform the upgrade. You must ensure that the user is only prompted to enter the Window XP product ID during the installation. Which command should you instruct the user to run?（） 

• A、sysprep.exe -nosidgen
• B、sysprep.exe -reseal
• C、winnt32 /duprepare
• D、winnt32. exe /unattend