问题：

[多选] You had installed an Active Directory Federation Services （AD FS） role on a Windows server 2008 in your organization. Now you need to test the connectivity of clients in the network to ensure that they can successfully reach the new Federation server and Federation server is operational. What should you do（）

A . Go to Services tab， and check if Active Directory Federation Services is running
B . In the event viewer， Applications， Event ID column look for event ID 674.
C . Open a browser window， and then type the Federation Service URL for the new federation server. 
D . None of the above