Over the years your company has developed a large set of EJB 2.1 components. Having
upgraded its servers to an EJB 3 implementation, your company is ready to develop EJB 3
components for the first time in order to use the new development features. Which two can be
implemented without upgrading an existing EJB 2.1 module to version 3, which would require
repackaging and retesting the module? (Choose two.)
A.
EJB 2.1 stateless session bean using an EJB 3 interceptor
B.
EJB 3 stateless session bean invoking an EJB 2.1 stateless session bean
C.
EJB 3 stateless session bean replacing an existing EJB 2.1 stateless session bean
D.
EJB 3 stateless session bean sharing a timer with a EJB 2.1 stateless session bean