You perform a clean installation of Windows XP Professional on a computer. The computer is a member of a workgroup. You need to enable offline files on the computer. What should you do first?（） 

• A、Disable Fast User Switching.
• B、Run the Accessibility Wizard. 
• C、Set the Startup type of the Volume Shadow Copy Service (VSS) to Automatic.
• D、Set the Startup type of the Network Location Awareness (NLA) service to Automatic.