Your company has client computers that run Windows XP Professional.   You are planning to install Windows 7 Enterprise on the existing client computers.    You need to ensure that the user state can be viewed after it has been collected and saved.    What are two possible ways to achieve this goal？（）

• A、Use a hard-link migration store
• B、Use an uncompressed migration store
• C、Perform an offline migration by using Windowsold
• D、Perform an offline migration by using Windows PE