Your network contains an Active Directory domain named contoso.com. The domain contains a server named Server1. Server1 runs Windows Server 2012 R2 and has the Hyper-V server role installed.
On Server1, you create a virtual machine named VM1.
When you try to add a RemoteFX 3D Video Adapter to VM1, you discover that the option is unavailable as shown in the following exhibit. (Click the Exhibit button.)

You need to add the RemoteFX 3D Video Adapter to VM1.
What should you do first?（）