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question on listener interface

 
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which interface must a class implement so that instances of the class are notified after any object is added to a session?
A. javax.servlet.http.HttpSessionListener
B. javax.servlet.http.HttpSessionValueListener
C. javax.servlet.http.HttpSessionBindingListener
D. javax.servlet.http.HttpSessionAttributeListener

the correct answer is D while i think it should be C.
 
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I also think it should be C
 
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Yup! The correct answer is C
 
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The correct answer is D. The key word is 'any'. If an object wants to be notified if it (the object itself) has been added to a session then the answer would be C. But to be notified if 'any' object is added to the session, the answer is D.
 
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