Which of the following is considered an aftermarket item for vehicles?

The correct answer is audio/video systems, as these are typically not included as standard equipment when a vehicle is manufactured and sold. Aftermarket items refer to products that are not made by the original equipment manufacturer (OEM) but are sold separately for installation after the vehicle has been purchased. Audio/video systems fit this description perfectly—they are added to a vehicle post-purchase to enhance entertainment options, providing customization that reflects the owner's personal preferences.

In contrast, original factory parts refer to components specifically manufactured for a vehicle by the original manufacturer—they are considered OEM items. Repair tools and safety equipment are typically associated with maintaining or servicing the vehicle rather than modifying it, and they also do not fall under the definition of aftermarket items. This distinction is important for understanding vehicle customization and the implications for investigations regarding vehicle modifications, such as potential alterations that could affect fire dynamics or safety features in the event of an incident.