Given:1. public class TestString1{2. public static void main(String[] args){3. String str = "420";4. str += 42;5. System.out.print(str);6. }7. }What is the output?
(A) 42
(B) 420
(C) 462
(D) 42042
(E) Compilation fails.F. An exception is thrown at runtime.