You need to deploy Active Directory Rights Management System （AD RMS） to secure all documents，  spreadsheets and to provide user authentication.          What do you need to configure， in order to complete the deployment of AD RMS（）

• A、Upgrade all client computers to Windows Vista. Install AD RMS on domain controller Certkiller _DC1
• B、Ensure that all Windows XP computers have the latest service pack and install the RMS client on all systems. Install AD RMS on domain controller Certkiller _DC1
• C、Upgrade all client computers to Windows Vista. Install AD RMS on Certkiller _SRV5
• D、Ensure that all Windows XP computers have the latest service pack and install the RMS client on all systems. Install AD RMS on domain controller Certkiller _SRV5
• E、None of the above