A company has an on-premises SharePoint farm. The company also uses SharePoint Online. Employees must be able to access on-premises sites and SharePoint Online resources. You must use single sign-on (SSO). You need to configure authentication. Which three options should you configure? Each correct answer presents part of the solution.
A. Windows Azure directory synchronization without Password Sync
B. server to server authentication
C. Active Directory Federation Services 2.0 with SSO
D. forward proxy configuration
E. Windows Azure directory synchronization with Password Sync