How can you ensure that only users that are members of the role named Employees can use the ConfirmOrder method?

DRAG DROP
Exhibit:
service contract [ServiceContract]
public interface IOrderProcessing
{
[OperationContract]
void ConfirmOrder(int id)
}
<ServiceContract>
Public Interface IOrderProcessing
<OperationContract>
Sub ConfirmOrder(ByVal id As Integer)
End Interface

There is a WCF (Windows Communication Foundation) service PassGuideService.
PassGuideService is implementing the service contract being displayed in the exhibit.
How can you ensure that only users that are members of the role named Employees can use the ConfirmOrder method?

Answer:

Explanation: