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Q37 Single choice

Which is a valid way of injecting a container-managed transaction-scoped persistence context into an EJB 3.0 session bean assuming the application contains only one persistence unit?

A
@PersistenceUnit public EntityManager em;
B
@PersistenceContext private EntityManager em;
C
@TransactionManagement(TransactionManagementType. CONTAINER) public EntityManager em;
D
@Resource(name="persistence/em", authenticationType=AuthenticationType.
CONTAINER) protected EntityManager em;

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