Which of the following are considered the three primary components of a fire alarm system?

The three primary components of a fire alarm system are the control unit, an initiating device, and a notification appliance. The control unit is the central hub that processes signals from the various initiating devices and manages the overall operation of the system. Initiating devices are responsible for detecting a fire or conditions indicative of a fire, such as smoke or heat; these include smoke detectors, heat detectors, and manual pull stations. Finally, notification appliances provide alerts to occupants, often in the form of alarms or visual signals, ensuring that people are made aware of the emergency situation and can take appropriate action.

This answer captures the essential structure and function of a fire alarm system, emphasizing that these three components work together to detect fires, alert occupants, and help ensure safety. Other choices contain elements that are not primary components of a fire alarm system; for example, fire extinguishers and fire hydrants are crucial for fire response but do not form part of the alarm system itself.