A. Add the WebInvoke(UriTemplate="/Items/{id}", Method="DELETE") attribute to the operation
B. Add the HttpDelete atribute to the operation
C. Replace the string parameter with a RemovedActivityAction parameter
D. Replace the return type with RemovedActivityAction.

A. [OperationContract(IsOneWay=true, Action="*", ReplyAction="*")] void PostData(Order data);
B. [OperationContract(IsOneWay=true, Action="*", ReplyAction = "*")] void PostData(BodyWriter data);
C. [OperationContract] void PostData(BodyWriter data);
D. [OperationContract] void PostData(Message data);