Which of the following is NOT a type of fireworks device?

The selection of D, Pyrotechnic Operator, is accurate because a pyrotechnic operator is a person, not a type of fireworks device. This individual is responsible for safely igniting and managing fireworks displays, ensuring adherence to safety protocols and regulations outlined in NFPA 1123.

Aerial shells, barrages, and cartridges, on the other hand, are all categorized types of fireworks devices. Aerial shells typically launch into the sky and explode to create various visual effects, while barrages refer to a series of fireworks that produce effects in quick succession, often designed for a stunning visual display. Cartridges are preloaded devices that can create specific effects or functions but do not represent a person or role like the pyrotechnic operator does. Hence, identifying the pyrotechnic operator as the answer reflects a clear understanding of the distinction between roles related to fireworks and the actual devices themselves.