Your network has client computers that run Windows XP.   Users do not have administrative rights to their local computers.   You use Windows Server Update Services （WSUS） to manage software updates. You are planning to deploy Windows 7.   Your company uses a custom application that is not compatible with Windows？7.   You need to ensure that all users are able to run the custom application.    What are two possible ways to achieve this goal？（）

• A、Deploy and register the compatibility-fix database file to the client computers by using a user startup script.
• B、Deploy and register the compatibility-fix database file to the client computers by using a computer startup script.
• C、Install and register a shim on the client computers by using Group Policy.
• D、Install and register a shim on the WSUS server.