You plan to upgrade a computer that runs Windows 2000 to Windows XP Professional. You need to verify that the applications currently installed on the computer will run after the upgrade. What should you do before you start the Windows XP Professional installation?（）

• A、From the Windows XP Professional source files, run winnt.exe /u. 
• B、From the Windows XP Professional source files, run Winnt32 /checkupgradeonly.
• C、Review the Windows Hardware Compatibility List on the Microsoft Web site. 
• D、Start the computer from the Windows XP Professional installation CD. When prompted, press F6.