What should you recommend? (More than one answer choice may achieve the goal

A company has servers that run Windows Server 2008 R2. Administrators use a graphic-intensive application to remotely manage the network. You are designing a remote network administration solution.

You need to ensure that authorized administrators can connect to internal servers over the Internet from computers that run Windows 7 or Windows Vista. Device redirection enforcement must be enabled for these connections.

What should you recommend? (More than one answer choice may achieve the goal. Select the BEST answer.)

A.
Deploy and configure a server with the Remote Desktop Web Access server role. Enable Forms-based authentication. Ensure that administrators use RDC 6.1 when accessing internal servers remotely.

B.
Deploy and configure a server with the Remote Desktop Web Access server role. Enable Forms-based authentication. Ensure that administrators use RDC 7.0 when accessing internal servers remotely,

C.
Deploy and configure a server with the Remote Desktop Gateway server role. Ensure that administrators use RDC 7.0 when accessing internal servers remotely.

D.
Deploy and configure a server with the Remote Desktop Gateway server role. Ensure that administrators use RDC 6.1 when accessing internal servers remotely.

Explanation:
http://windows.microsoft.com/en-us/windows7/What-is-a-Remote-Desktop-Gateway-server

A Remote Desktop Gateway (RD Gateway) server is a type of gateway that enables authorized users to connect to remote computers on a corporate network from any computer with an Internet connection. RD Gateway uses the Remote Desktop Protocol (RDP) along with the HTTPS protocol to help create a more secure, encrypted connection.

http://technet.microsoft.com/en-us/library/dd560672%28v=ws.10%29.aspx

Device redirection enforcement

An RD Gateway server running Windows Server 2008 R2 includes the option to allow remote desktop clients to only connect to RD Session Host servers that enforce device redirection. RDC 7.0 is required for device redirection to be enforced by the RD Session Host server running Windows Server 2008 R2.

Device redirection enforcement is configured on the Device Redirection tab of the RD CAP by using Remote Desktop Gateway Manager.