Your company has an Active Directory Domain Services (AD DS) domain. You install the Remote Desktop Session Host (RD Session Host) role service and the Microsoft Application Virtualization (App-V) 4.6 client on a server that runs Windows Server 2008 R2. You publish applications to the RD Session Host server by using App-V. Partner companies require access to an internal application. You provide each partner company with a preconfigured Remote Desktop Protocol (.rdp) file that enables the company to access the application by using the Connect From Anywhere feature. You need to specify the protocol that each partner company must allow through its firewall to establish the connection. Which protocol should you specify?（）

• A、RDP
• B、HTTPS
• C、RTSP
• D、RTSPS