What happens when you compile and run the following program?

public class X
{
    public static void main(final String[] args)
    {
        final String a = "hello world";
        final String b = "hello" + " world";
        System.out.println("a == b is " + a == b);
    }
}

A) Compilation error.
B) Output "a == b is false
C) Output "a == b is true
D) Output true
E) Output false