Question 6 2 pts Here is the indexOf method of ArrayList class: // Returns the index of the first occurrence of the specified element public int indexOf(object o) { if (0 == null) { for (int i = 0; i list; } // end class SomeClass This class is designed based on composition and the ArrayList class is the container class. This SomeClass needs to have an int instance data member to track the number of elements list holds. We can have this statement in main after scis declared: int size = sc.list.size(); We may create an object of ArrayList type