You have an Active Directory Domain Services (AD DS) domain. All servers run Windows Server 2008 R2. The Remote Desktop Services (RDS) environment includes a Remote Desktop Session Host (RD Session Host)  server in the LAN environment, and a Remote Desktop Gateway (RD Gateway) server in the perimeter network.
You deploy a Remote Desktop Web Access (RD Web Access) server in the perimeter network.
You publish a RemoteApp application. The RemoteApp application is not visible to users when they log in to RD Web Access.
You need to ensure that authorized users can run RemoteApp applications from RD Web Access.
What should you do?（）

Your company has an Active Directory Domain Services (AD DS) domain. You are installing the RD Session Host (RD Session Host) role service in Server Manager on a server that runs Windows Server 2008 R2.
The Audio and video playback check box on the Configure Client Experience page is not available.
You need to ensure that you can enable audio and video playback for users connecting to the RD Session Host server.
Which two actions should you perform? （）