Final answer:
Trucks approved for fire safety must bear a label or identifying mark indicating their compliance with fire safety standards, helping emergency responders identify the trucks and their capabilities.
Step-by-step explanation:
In the context of fire safety, trucks that are approved for fire safety must bear a label or some other identifying mark that indicates their compliance with fire safety standards. This label serves as an indication to firefighters and other emergency responders that the truck has been designed and equipped to meet certain safety requirements, such as having appropriate fire suppression systems, emergency exits, and other features to prevent or mitigate fire hazards. The label also helps in quickly identifying the type of truck and its capabilities in emergency situations.