In the method to$\_$last from the previous question, we said you could assume that self

was not an empty linked list.

Why did we want you to make this assumption when completing the code?

The code would raise an AttributeError because curr would be initialized to None.

The code would raise a TypeError because None cannot be compared against a $\_$Node object.

The code would raise an IndexError because an empty linked list has no "last" item.

No reason; the code as written would satisfy its docstring even when the linked list is empty.