You are designing a Windows 7 virtual desktop infrastructure.You have the following requirements：   Provide access to Remote Desktop Services RemoteApp sources from multiple remote desktop servers.  Support network load balancing.  Support reconnection to existing sessions on virtual desktops.    You need to specify a design that meets the requirements.   What should you include in your design？（）

• A、Remote Desktop Gateway
• B、Remote Desktop Connection Broker
• C、Windows Deployment Services
• D、Windows Virtual PC and Windows XP Mode