You are developing a WCF service. The service includes an operation names GetProduct. You need to ensure that GetProduct will accept a POST request and will indicate that the returned data is XML. Which two actions should you perform?（）

Add the WebGet attribute to the service contract.
B. Set WebOperationContext.Current.OutgoingRequest.ContentType to "text/xml" in the GetProduct method.
C. Add the WebInvoke attribute to the service contract.
D. Set WebOperationContext.Current.OutgoingResponse.ContentType to "text/xml" in the GetProduct method.