For the Questions Below, Use the Following Partial Class Definitions

For the questions below, use the following partial class definitions:
public class A1
{
public int x;
private int y;
protected int z;
...
}
public class A2 extends A1
{
protected int a;
private int b;
...
}
public class A3 extends A2
{
private int q;
...
}
-Which of the following is True with respect to A1, A2 and A3?

A) A1 is a subclass of A2 and A2 is a subclass of A3
B) A3 is a subclass of A2 and A2 is a subclass of A1
C) A1 and A2 are both subclasses of A3
D) A2 and A3 are both subclasses of A1
E) A1, A2 and A3 are all subclasses of the class A