You develop a Windows Communication Foundation (WCF) service that employees use to access bonus information.You define the following service contract. (Line numbers are included for reference only.)<br /> 01 [ServiceContract(SessionMode = SessionMode.Required)]<br /> 02 public interface IFinancialService<br /> 03 {<br /> 04 [OperationContract]<br /> 05 string Login(int employeeID, string passwordHash);<br /> 06<br /> 07 [OperationContract]<br /> 08 double GetBonus(int month);<br /> 09<br /> 10 [OperationContract(IsTerminating = true)]<br /> 11 void Logout（　）;<br /> 12 }<br /> Client application can invoke methods without logging in. You need to ensure that the client applications invoke Login before invoking any other method. You also need to ensure that client applications cannot consume the service after invoking Logout.<br /> Which two action should you perform? （）(Each correct answer presents part of the solution. Choose two.)。