Which statements concerning the following code are true?
class A
{
public A() {> // A1
public A(String s) { thisO; System.out.println("A :"+s); > // A2
>
class 3 extends A
{
public int B(String s) { System.out.println("B :”+s); return 0; > // B1
>
class C extends B
{
private C(){ supe