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EPractice Lab quiz 2 about HttpSessionBindingListener's valueUnbound

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Which interface must a class implement so that instances of the class are notified after any object is removed from a session?

a. javax.servlet.http.HttpSessionAttributeListener
b. javax.servlet.http.HttpSessionListener
c. javax.servlet.http.HttpAttributeSessionListener
d. javax.servlet.http.HttpSessionBindingListener

Choice A is correct
HttpSessionAttributeListener listener interface can be implemented in order to get notifications of changes to the attribute lists of sessions within this web application.

I think D can be the option. When an object ,which implements HttpSessionBindingListener, is removed from the attribute list of a session, valueUnbound() is called.
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