As discussed in class, the following implementation for DoublyLinkedList Conductor hasNext doesn't work correctly: public boolean hasNext) f return car.next != null; Instead, we had to put the following: public boolean hasNext) t return car != null; What was wrong with the behavior of the old hasNext implementation? It returned false for the first (head) element of the list O It returned false for the last (tail) element of the list ( It never returned false It always returned false