70-513 Question #35: Real Exam Question with Answer & Explanation

You are developing a client application that consumes a Windows Communication Foundation (WCF) service. You use the svcutil.exe utility to create a proxy for the service. You use the svcutil.exe switches that generate asynchronous calls. GetFlight is a service operation that takes no parameters and returns a string. The GetFlightCallback method must be called when the service operation returns. You create an instance of the client proxy with the following code: var client = new TranvelServiceClient(); You need to ensure that a callback is received when the GetFlight operation is called asynchronously. Which code segment should you use?