Dúvida questão do Inquisition

package inquisition;

public class Test52{
	public static void main(String[] args){
		int []arr = {1,2,3,4};
		for ( int i : arr )
		{
		  System.out.println("i :"+i);
		  System.out.println("antes :"+arr[i]);
		  arr[i] = 0;
		  System.out.println("depois :"+arr[i]);
		  System.out.println();
		}

		for ( int i : arr )
		{
		   System.out.println(i);
		}
	}
}
/*
i :1
antes :2
depois :0

i :0
antes :1
depois :0

i :3
antes :4
depois :0

i :0
antes :0
depois :0

0
0
3
0

The correct answer is D.
This so happens because arr[3] was made 0 during an iteration of the first "for in loop".
So during the final iteration of the first ??for in loop?? , we have 0 instead of 4 in the last index.
It can be seen from the second loop why an ArrayIndexOutOfBoundsException was not thrown at runtime.
The maximum number in the array is 3 which does not exceed the bound of the loop
*/