A smoke detector must be marked with their nominal production_______and tolerance.

The correct response highlights that a smoke detector should indeed be marked with its nominal production sensitivity and tolerance because sensitivity directly relates to the detector's ability to respond to smoke particles in the air. This measurement indicates how effectively the detector can distinguish between normal conditions and potentially hazardous smoke conditions.

Sensitivities are crucial for ensuring that the detector operates within established safety guidelines. Different types of smoke detectors, such as photoelectric or ionization types, have various sensitivity levels, which can impact their performance in the environments for which they are installed. Understanding a smoke detector's sensitivity helps ensure it is used correctly in accordance with applicable codes and regulations.

In contrast, the other options do not apply directly to the marking requirements of smoke detectors as they focus on other aspects. For example, while a "listing" pertains to the certification that indicates compliance with relevant standards, it is not the primary focus when discussing sensitivity. Similarly, "temperature" relates to the operational range of devices but does not specify the detector's responsiveness to smoke, while "distance" generally refers to the spacing between detectors and not their production specifications.