Certkiller.com has a server with Active Directory Rights Management Services （AD RMS） server installed. Users have computers with Windows Vista installed on them with an Active Directory domain installed at Windows Server 2003 functional level. As an administrator at Certkiller.com， you discover that the users are unable to benefit from AD RMS to protect their documents. You need to configure AD RMS to enable users to use it and protect their documents. What should you do to achieve this functionality（）

• A、Configure an email account in Active Directory Domain Services （AD DS） for each user.
• B、Add and configure ADRMSADMIN account in local administrators group on the user computers
• C、Add and configure the ADRMSSRVC account in AD RMS server’s local administrator group
• D、Reinstall the Active Directory domain on user computers
• E、All of the above