Question:Given two String variables str1="Hello" and str2="World", which of the following 2 ways can be used to concatenate the 2 strings and store the result in str1? 

A str1= str1+str2; 
B str2.concat(str1,str2); 
C str1.concat(str1,str2); 
D str1.concat(str2); 
E str2.concat(str1); 

+ Answer
D 

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Md. Habib Ullah

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