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(e) In JSF framework, when using h:commandButton, a web form is submitted to the server through an HTTP POST request. This does not provide the expected security features mainly when refreshing/reloading the server response in the web browser. Explain this problem and give an example. What is the mechanism that is used to solve this problem? (1) Explain the difference between the three classes A, B and C that are shown below. What are the conditions of implementing each class? Who is responsible for managing the lifecycle of any created instance of these classes? Named @Stateless public class A {..} public class B {..] public class C {..}