You subscribe to Office 365. You plan to implement single sign-on. You need to deploy Active Directory
Federation Services (AD FS) to a server for the planned implementation. Which deployment methods should you use? (Each correct answer presents a complete solution. Choose all that apply.) package known as AD FS 2.0.

A.
On a server that runs Windows Server 2008 R2, download and install AD FS 2.0.

B.
On a server that runs Windows Server 2008, download and install AD FS 2.0.

C.
On a server that runs Windows Server 2008, install the AD FS server role.

D.
On a server that runs Windows Server 2008 R2, install the AD FS server role.

Explanation:

You can install AD FS on Windows Server 2008 and Windows Server 2008 R2 computers using an installation
References: https://technet.microsoft.com/en-us/library/dn151310.aspx