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"?()
- Asb1.append("abc"); s1.append("abc");
- Bsb1.append("abc"); s1.concat("abc");
- Csb1.concat("abc"); s1.append("abc");
- Dsb1.concat("abc"); s1.concat("abc");
- Esb1.append("abc"); s1 = s1.concat("abc");