Your company has an Active Directory Domain Services (AD DS) domain. All servers run Windows Server 2008 R2. All client computers run Windows 7. Remote client computers are not members of the domain. Your environment includes a Remote Desktop Gateway (RD Gateway) server. You install an application on a Remote Desktop Session Host (RD Session Host) server. You need to ensure that remote users can run the application. What should you do？（）

• A、On each remote client computer, configure the Remote Desktop Connection client to connect to the RD Gateway server.
• B、On each remote client computer, configure the Remote Desktop Connection client to connect without warning if server authe ntication fails.
• C、On the RD Session Host server, configure the Remote Desktop Connection client to connect to the RD Gateway server.
• D、On the RD Gateway server, add the Guests local group to the Remote Desktop Users local group.