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))]

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