An active fire alarm system can provide the fire investigator with:

An active fire alarm system is designed to detect and respond to smoke, heat, and other indicators of a fire, and in doing so, it collects and records various data that can be invaluable for a fire investigation. The system can provide multiple data points, such as information on the time of activation, which sensors were triggered, and potential environmental conditions at the time of the alarm. This information helps investigators understand not only when the fire was detected but also the specific circumstances leading to the alarm, assisting in determining the fire's point of origin and cause.

The comprehensive nature of an active fire alarm system makes it a crucial tool for investigators, enabling them to piece together the incident more effectively. Other options imply limitations that do not reflect the capabilities of an active fire alarm system; it is certainly more than just visual aids or sound data and provides various points of data that inform the investigation process.