What will be the output of the following C# code?

class list
{
    ArrayList array = new ArrayList();
    public object this[int index]
    {
        get
        {
            if (index < 0 || index >= array.Count)
            {
                return null;
            }
            else
            {
                return (array[index]);
            }
        }
        set
        {
            array[index] = value;
        }
    }
    public int Count 
   { 
       get;
       set; 
   }
}
class Program
{
    static void Main(string[] args)
    {
        list list1 = new list();
        list1[0] = "123";
        list1[1] = " abc ";
        list1[2] = "xyz";
        for (int i = 0; i<=list1.Count; i++)
        Console.WriteLine(list1[i]);
        Console.ReadLine();
    }
}

A. Compile time error

B. Run time error

C. 123, abc, xyz

Answer: Option B