What are the 3 things that a WCF Services end point must have?
Address - The address where the WCF Service is hosted.
Binding - The binding that decides the protocol, message encoding and security to use. Binding also decides whether to use reliable messaging and transaction support.
Contract - The service contract defines what service operations are available to the client for consumption.
So the Address(A), Binding(B) and Contract(C) are called as the ABC of the service end point.