Which interface must a session attribute implement if it needs to be notified when a web container persists a session?

Which interface must a session attribute implement if it needs to be notified when a web container
persists a session?

A.
javax.servlet.http.HttpSessionListener

B.
javax.servlet.http.HttpSessionBindingListener

C.
javax.servlet.http.HttpSessionAttributeListener

D.
javax.servlet.http.HttpSessionActivationListener

Explanation: