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What will be the output of the following program?

What will be the output of the following program?

class Stringtest

{

public static void main(String args[])

{

String s= "test";

s.concat("paper");

System.out.println(s);

}

}

A.

It will display test.

B.

It will display testpaper.

C.

It will generate a compile-time error.

D.

It will display paper.

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