Which of the following best describes a function of smoke detectors?

Smoke detectors are primarily designed to identify the presence of smoke, which is an indicator of fire. Their main function is to alert occupants of a building, such as homeowners, to the potential danger posed by smoke and, consequently, fire. When smoke is detected, the smoke detector emits a loud alarm, which is critical for ensuring that people can evacuate the premises safely and swiftly. This crucial safety feature can significantly reduce the risk of injury or death due to fire.

While carbon monoxide detectors, home heating systems, and security monitoring systems serve important roles in home safety and automation, they are not functions of a smoke detector. Carbon monoxide levels are monitored by a different type of detector designed specifically for that purpose. Similarly, controlling home heating or managing security systems falls outside the scope of what smoke detectors are intended to do. Their singular focus on detecting smoke is what makes them an essential component of fire safety in residential and commercial settings.