Which of the following is categorized as an impact weapon?

The expandable baton is categorized as an impact weapon because it is designed to deliver a blow to a subject with the intent of incapacitating or controlling them. These weapons are typically used in situations where a physical response is necessary to subdue an individual. The design of the baton allows for striking and controlling actions, making it effective in managing subjects without resorting to lethal force.

In contrast, a Taser delivers an electrical shock to incapacitate a person, rather than making physical contact through impact. Handcuffs are restraint devices that secure an individual's wrists and do not function as weapons for striking. OC spray, or pepper spray, is a chemical agent used to deter individuals through irritation but does not involve impact. Therefore, the expandable baton stands out as the only option that directly fulfills the criteria of an impact weapon.