Elance Exams Answers PDF file

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Which of the following ways can be used to concatenate String str1 and String str2? 1). str1 = str1 + str2; 2). str1.concat(str2); 3). str1.concat(str1, str2); 4). str1 += str2;

1, 3, and 4
1, 2, and 3
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1, 2, and 4
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