You are designing a client computer upgrade strategy for Contoso.Ltd. What should you do?（）

• A、Use the ldifde command to migrate user settings.  
• B、Use the User State Migration Tool (USMT) to Migrate user settings.  
• C、Create trust relationships between the Chicago domain and the San Francisco domain. Use the Active Directory Migration Tool (ADMT) to migrate user settings.  
• D、Create trust relationships between the forest root domain and the San Francisco domain. Use the Active Directory Migration Tool (ADMT) to migrate user settings.