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To be informed whenever an attribute is added, removed, or replaced in a session, a class must have a method with HttpSessionBindingEvent as its attribute. The HttpSessionBindingEvent class extends the HttpSessionEvent class. The HttpSessionBindingEvent class is used with the following listeners: HttpSessionBindingListener: It notifies the attribute when it is bound or unbound from a session. HttpSessionAttributeListener: It notifies the class when an attribute is bound, unbound, or replaced in a session. The session binds the object by a call to the HttpSession.setAttribute() method and unbinds the object by a call to the HttpSession.removeAttribute() method. Answer: C is incorrect. The HttpSessionEvent is associated with the HttpSessionListener interface and HttpSessionActivationListener.