Your network consists of a single Active Directory domain. Your network contains 10 servers and 500 client computers. All domain controllers run Windows Server 2008 R2. A Windows Server 2008 R2 server  has Remote Desktop Services installed. All client computers run Windows XP Service Pack 3.  Youplan to deploy a new line-of-business application. The application requires desktop themes to be  enabled.   You need to recommend a deployment strategy that meets the following requirements： èOnly authorized users must be allowed to access the application.   èAuthorized users must be able to access the application from any client computer. èYour strategy must minimize changes to the client computers.  èYour strategy must minimize software costs. What should you recommend？（）

• A、Migrate all client computers to Windows 7. Deploy the application to all client computers by using a Group Policy object （GPO）.
• B、Migrate all client computers to Windows 7. Deploy the application to the authorized users by using a Group Policy object （GPO）.
• C、Deploy the Remote Desktop Connection （RDC） 7.0 software to the client computers. Install the  application on the Remote Desktop Services server. Implement Remote Desktop Connection Broker （RD Connection Broker）.
• D、Deploy the Remote Desktop Connection （RDC） 7.0 software to the client computers. Enable the  Desktop Experience feature on the Remote Desktop Services server. Install the application on the  Remote Desktop Services server.