You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service…

You are creating a Windows Communication Foundation (WCF) service. You do not want to expose the internal implementation at the service layer. You need to expose the following class as a service named Arithmetic with an operation named Sum. Public Class Calculator Public Function Add (ByVal x As Integer, ByVal y As Integer) As Integer End Function End Class Which code segment should you use?