What type of device is responsible for alerting occupants that a fire alarm has been activated?

The type of device responsible for alerting occupants when a fire alarm has been activated is the alarm notification device. This includes devices such as horns, bells, and strobe lights, which are designed to effectively convey an urgent message to all occupants in the building. When the fire alarm system detects smoke or heat, the alarm notification devices activate, ensuring that individuals are alerted to evacuate or take appropriate action in response to the emergency. These devices play a critical role in ensuring the safety of building occupants by providing clear and immediate audio and visual signals.

Other options, while related to fire alarm systems, serve different functions. Alarm initiation devices are used to detect the presence of fire or smoke and trigger the fire alarm system but do not provide notifications to occupants. Fire suppression systems are mechanisms that actively extinguish fires but do not provide alerts to people in the building. Remote annunciators are panels that provide information about the status of a fire alarm system but are generally used for monitoring rather than directly alerting occupants.