Which two code fragments can be used on Line 22 to persist an order instance assuming that all references are properly initialized?

Given this Java EE application that uses a JTA application-managed entity manager:
20. UserTransaction utx = …;
21. utx.beginQ;
22. // insert code here
23. utx.commitQ;
Which two code fragments can be used on Line 22 to persist an order instance assuming that all
references are properly initialized? (Choose two.

A.
em.merge(order); em.flushQ;

B.
em.persist(order); em.flushO;

C.
em.joinTransactionO; em.persist(order);

D.
em = emfcreateEntityManagerQ; em.persist(order);