单选题Which interface must a session attribute implement if it needs to be notified when a web container persistsa session？（）Ajavax.servlet.http.HttpSessionListenerBjavax.servlet.http.HttpSessionBindingListenerCjavax.servlet.http.HttpSessionAttributeListenerDjavax.servlet.http.HttpSessionActivationListener
单选题
Which interface must a session attribute implement if it needs to be notified when a web container persistsa session？（）
A
javax.servlet.http.HttpSessionListener
B
javax.servlet.http.HttpSessionBindingListener
C
javax.servlet.http.HttpSessionAttributeListener
D
javax.servlet.http.HttpSessionActivationListener
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