What will be the result of an attempt to compile and run the following program?

class Test
{

public static void main(String args[])
{

String s1 = "abc";
String s2 = "abc";
s1 += "xyz";
s2.concat("pqr");
s1.toUpperCase();
System.out.println(s1 + s2);

}

}

Choices:

• A. "abcxyzabc"


• B. "abcxyzabcpqr"


• C. "ABCXYZabcpqr"


• D. "ABCXYZabc"


• E. Code does not compile

Correct choice:

•  A

Explanation: