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question from book ,Sun Certified Enterprise Architect for J2EE™ Technology Study

 
Timber Lee
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4. If you are implementing an entity bean, which class is not required?
A. javax.ejb.EJBObject
B. javax.ejb.Entity
C. javax.ejb.EJBRemote
D. java.ejb.EJBHome
ans. is c. how about ans. b
 
Gus Mus
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I think it's typo, it's should be javax.ejb.EntityBean
 
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