Final answer:
When welding or cutting near combustibles and flammable materials, having Firewatch personnel on hand is recommended to prevent and respond to fires promptly. They complement other safety measures such as fire extinguishers, water hoses, and proper ventilation.
Step-by-step explanation:
When welding or cutting in locations with combustibles and flammable materials, it is essential to ensure safety to prevent fires. Safety precautions include having the right equipment and personnel on hand to deal with potential hazards. Among the options provided, having a Firewatch personnel is recommended because they are trained to identify and respond to fire hazards immediately, which is especially important in environments where there are combustibles and flammable materials. While having a fire extinguisher nearby, a water hose ready, and ventilation fan running can also be part of the safety measures, having Firewatch personnel is crucial as they can take immediate action in case a fire breaks out. In addition to Firewatch personnel, it's also advised to work in a well-ventilated area, know the locations of fire extinguishers and eyewash stations, and use personal protective equipment like gloves and helmets.