Which best describes the difference between detection and suppression systems?

• A. Detection identifies and alerts occupants; suppression controls or extinguishes fires
• B. Detection suppresses fires
• C. They are the same
• D. Detection is optional

Answer: (A)

The main concept here is understanding how detection systems differ from suppression systems in fire safety. Detection systems sense signs of a fire—smoke, heat, or flame—and alert occupants and sometimes responders. Suppression systems take action to control or extinguish the fire, using water, foam, gas, or other agents, either automatically or manually.

That combination—detection identifying a fire and alerting people, while suppression actively fights or contains the fire—best describes the distinction. Detection is about warning and initiating response; suppression is about reducing the fire's growth and spread.

The other statements don’t fit because detection does not suppress fires, they are not the same function, and detection is not typically optional in modern building safety, where codes and standards usually require it. Often these systems work together, with detection triggering suppression actions when needed.