How many means of escape and ladders should be available when personnel are working on a roof of upper stories?

The correct response emphasizes the importance of safety when personnel are operating on rooftops or upper stories. Having two means of escape ensures that there are multiple options for personnel to exit in case of an emergency, which is critical for minimizing risks. This redundancy can help avoid situations where the primary escape route is compromised.

In addition, having a total of two ladders complements this by providing additional options for evacuation or access. Ladders can be crucial when personnel need to move quickly or when one ladder is not accessible due to fire or other hazards. Ensuring two escape routes with two ladders enhances overall safety, allowing firefighters to respond effectively to any unforeseen incidents while ensuring that they can evacuate safely and efficiently.

Overall, this choice supports best practices in emergency response and risk management, particularly in high-risk environments like rooftops.