DRAG DROP
You are developing a self-hosted WCF service that returns stock market information. The
service must be discoverable by any client application. You need to build the service host.
How should you build the host? (To answer, drag the appropriate code segments to the
correct location or locations in the answer area. Each code segment may be used once,
more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)
Answer: 
see this link for verification
https://msdn.microsoft.com/en-us/library/dd456783(v=vs.110).aspx
Also see this link. I agree with the provided answer and think it should be UdpDiscoveryEndpoint https://msdn.microsoft.com/en-us/library/hh556229%28v=vs.110%29.aspx
“UdpBinding is useful in scenarios where a service needs to send out small messages to a number of clients simultaneously. A stock ticker application is an example of such a service.”
I think there quiet a difference between UdpBinding and UdpDiscoveryEndpoint.