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Which code fragment, inserted at line 24, outputs 123ab……

Which code fragment, inserted at line 24, outputs "123abc 123abc"?()



A.sb1.append("abc"); s1.append("abc");
B.sb1.append("abc"); s1.concat("abc");
C.sb1.concat("abc"); s1.append("abc");
D.sb1.concat("abc"); s1.concat("abc");
E.sb1.append("abc"); s1=s1.concat("abc");
F.sb1.concat("abc"); s1=s1.concat("abc");

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