Four claims about action-reaction force pairs (Newton's third law) are listed below as I to IV. Select the option that names every correct claim and no incorrect one.

• I. The action and reaction forces of a pair always act on two different bodies.
• II. Action and reaction cancel each other, so the net force on any body is always zero.
• III. For a book resting on a table, the book's weight and the normal force from the table on the book form an action-reaction pair.
• IV. Action and reaction are equal in magnitude even when the interacting bodies are accelerating.