Your company has an Active Directory Domain Services (AD DS) domain. You install the Remote Desktop Session Host (RD Session Host) role service on a server that runs Windows Server 2008 R2. Client computers run Windows Vista and Windows 7. You need to automate the migration of user settings from client computers to the RD Session Host server. Which tool should you use?（）

• A、Windows Easy Transfer
• B、User State Migration Tool (USMT)
• C、Windows System Image Manager (Windows SIM)
• D、Deployment Image Servicing and Management (DISM)