Which statement is true about EJB 3.0 stateful session beans and stateless session beans? (Choose one)
a. Both can have multiple remote and local business interfaces
b. Only the stateful session bean class is required to implement java.io.Serializable interface
c. Both can be passivated by the EJB container to preserve resource
d. Only the stateless session bean class is required to implement java.io.Serializable interface
Answer: A
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