单选题Which interface must a class implement so that instances of the class are notified after any object is addedto a session？（）Ajavax.servlet.http.HttpSessionListenerBjavax.servlet.http.HttpSessionValueListenerCjavax.servlet.http.HttpSessionBindingListenerDjavax.servlet.http.HttpSessionAttributeListener
单选题
Which interface must a class implement so that instances of the class are notified after any object is addedto a session？（）
A
javax.servlet.http.HttpSessionListener
B
javax.servlet.http.HttpSessionValueListener
C
javax.servlet.http.HttpSessionBindingListener
D
javax.servlet.http.HttpSessionAttributeListener
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