What two elements must fire guards have a general knowledge of?

The correct answer emphasizes the importance of fire guards having a general knowledge of portable extinguishers and alarm systems. Fire guards play a crucial role in maintaining safety protocols and responding to fire emergencies. A solid understanding of portable extinguishers is essential because fire guards need to know how to operate these devices properly to effectively combat small fires before they escalate. Knowledge of alarm systems is equally important, as it allows them to understand how alarms function, ensure they are operational, and can take the necessary actions when alarms are triggered, such as alerting personnel and coordinating evacuations.

With this foundational knowledge, fire guards can contribute to a safer environment, respond appropriately during emergencies, and assist in educating others about fire safety measures. The other options, while related to safety and emergency preparedness, do not capture this specific focus on the critical equipment and systems that are directly utilized in fire situations.