Consider the following partial class definitions:

public class A$1$

$\{$

public int x;

private int y;

protected int z;

$...$

$\}$

public class A$2$ extends A$1$

$\{$

protected int a;

private int b;

$...$

$\}$

public class A$3$ extends A$2$

$\{$

private int q;

$...$

$\}$

Which of the following is true regarding the use of instance data y of class A$1?$

Group of answer choices

It is accessible in A$1,$ A$2$ and A$3$

It is accessible in A$1$ and A$2$

It is accessible only in A$1$

It is accessible only in A$3$

It is not accessible to any of the three classes