What is output by the code below?

public class A

{

private int one;

public A(int o){

one=o;

}

public void setOne(int o){

one = o;

}

public int getOne(){

return one;

}

}

public class B

{

public void changeOne(A param){

param=new A(0);

param.setOne(7);

}

public void changeTwo(A param){

param.setOne(4);

}

public void changeThree(A param){

param.setOne(9);

param=new A(0);

}

}

//code in the main of another class

B test = new B();

A theA = new A(2);

test.changeTwo(theA);

System.out.println(theA.getOne());

a.	2
b.	0
c.	7
d.	9
e.	4