Given： 22.StringBuilder sb1 = new StringBuilder（"123"）； 23.String s1 = "123"； 24.// insert code here 25.System.out.println（sb1 + " " + s1）； 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"）；
Given： 22.StringBuilder sb1 = new StringBuilder（"123"）； 23.String s1 = "123"； 24.// insert code here 25.System.out.println（sb1 + " " + s1）； 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"）；
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