Your company has client computers that run Windows Vista. The company plans to upgrade the Windows Vista computers to Windows 7. The current configuration of all client computers in your company is based on a common Windows Vista image. Some branch offices use WAN connections to connect to the main office. You have the following requirements： Transfer all user data from the original Windows Vista installation to the new Windows 7 installation. Use the least amount of bandwidth while transferring the user data. Support the same migration strategy for all offices. You need to design a user state migration strategy that supports the requirements. What should you do？（）
- AUse the multicast feature of Windows Deployment Services （WDS）
- BUse the Deployment Image Servicing and Management （DISM） tool
- CUse the User State Migration Tool （USMT） and a hard-link migration store
- DUse Windows PE to perform an offline migratio