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: 
May be should be used just DiscoveryEndpoint?
While a DiscoveryEndpoint is necessary to meet the application requirements, there is no need for a UdpDiscoveryEndpoint specifically.
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I also think its discoveryendpoint
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Answer is correct.
For details:
https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/how-to-programmatically-add-discoverability-to-a-wcf-service-and-client?redirectedfrom=MSDN
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