You are developing a Windows Communication Foundation （WCF) service that contains the foll

You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.[ServiceContract()]public interface IPaymentService{ [OperationContract()] void RecordPayments(Person person);}public class Person{ ... }public class Employee : Person{ ... }public class Customer : Person{ ... }You need to ensure that RecordPayments can correctly deserialize into an Employee or a Customer object.What should you do？（）

A. Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(GetType(Person))]

B. Implement the IExtensibleDataObject interface in the Person class.

C. Implement the IExtension(ofType(T)) interface in the Person class.

D. Add the following KnownType attributes to the Person class. [KnownType(GetType(Employee))] [KnownType(GetType(Customer))]