Given the following declarations
(Choose 1 answer)
String s1=new String("Hello")String s2=new String("there");
String s3=new String();Which of the following is legal operation?
A. s3=s1 + s2;
B. s3=s1-s2;
C. s3=s1 & s2;
D. s3=s1 && s2
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