All servers on your network run Windows Server 2008 R2. You are planning a deployment of a virtual desktop infrastructure （VDI）. You need to estimate the number of servers required for the deployment. Which factor should you consider？（）

• A、the number of static and dynamic sessions for the VDI clients
• B、the Remote Desktop Protocol （RDP） version that clients will connect with
• C、the deployment method for VDI operating systems
• D、the provisioning method for VDI desktops