Your network contains an Active Directory domain named contoso.com. The network contains client computers that run either Windows Vista or Windows 7.  Active Directory Rights Management Services  （AD RMS） is deployed on the network.   You create a new AD RMS template that is distributed by using the AD RMS pipeline. The template is  updated every month.   You need to ensure that all the computers can use the most up-to-date version of the AD RMS template.   You want to achieve this goal by using the minimum amount of administrative effort.   What should you do（）

• A、Upgrade all of the Windows Vista computers to Windows 7.
• B、Upgrade all of the Windows Vista computers to Windows Vista Service Pack 2 （SP2）.
• C、Assign the Microsoft Windows Rights Management Services （RMS） Client Service Pack 2 （SP2） to all  users by using a Software Installation extension of Group Policy.
• D、Assign the Microsoft Windows Rights Management Services （RMS） Client Service Pack 2 （SP2） to all  computers by using a Software Installation extension of Group Policy.