Which of the following statements is true about fire alarms?

Fire alarms play a crucial role in maintaining safety during emergencies, specifically by alerting occupants of a potential fire. This alert system is vital for enabling people to evacuate the premises promptly, thereby reducing the risk of injury or loss of life. Fire alarms are designed to sound an alert when they detect smoke or heat, which helps ensure that individuals can respond quickly to the danger.

This function of alerting occupants is essential regardless of whether the building is commercial, residential, or industrial. It supports the overarching goal of safeguarding lives through timely notifications about fire incidents.

The other options do not accurately reflect the comprehensive capabilities and functionalities of fire alarms. They are equipped with sensors that can detect not only smoke but also heat and other indicators of fire, making them versatile in emergency situations. Additionally, while their effectiveness may diminish in particularly noisy environments, they typically use distinctive sounds or signals to ensure they are noticed. Lastly, fire alarms are not limited to commercial settings; they are required in residential buildings as well to comply with safety regulations.