Which session bean maintain their state between client invocations but are not required to maintain their state across server crashes or shutdowns?

Which session bean maintain their state between client invocations but

1.	Which session bean maintain their state between client invocations but are not required to maintain their state across server crashes or shutdowns?
A.	Stateful Session Bean
B.	Stateless Session Bean
C.	Singleton Session Bean
D.	None of the above
Answer» D. None of the above