Which option is NOT a PIES component?

• A. Sensor
• B. Power Source
• C. Initiator
• D. Explosive

Answer: (A)

In this context, PIES refers to the three essential elements that energize or trigger a device: Power Source, Initiator, and Explosive. The Power Source provides the energy, the Initiator supplies the trigger that starts the sequence, and the Explosive is the material that undergoes rapid energy release. A Sensor isn’t part of that core set in this framework; it may exist in some devices to detect conditions or provide feedback, but it’s not considered a PIES component. Therefore, the option describing a Sensor isn’t a PIES component.