Consider the following class declarations.

public class A { private int num; public A(int n) { num = n; } public void setNum(int n) { num = n; } } public class B extends A { public B(int n) { /* Constructor body */ } } 

Which of the following replacements for /* Constructor body */ will allow class B to compile?

1. super(n);

2. super(0); num = n;

3. super(); setNum(n);

III only

I, II and III

I only

I and II only

I and III only