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?（）

• A、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.