Which is a primary purpose of audible notification appliances in security systems?

The primary purpose of audible notification appliances in security systems is to deter intruders. These devices are designed to create loud sounds, such as alarms or sirens, when a security system is triggered. The loud noise acts as a warning signal not only to the property owner but primarily to potential intruders, aiming to dissuade them from continuing their unauthorized activity. This deterrent effect is crucial in preventing theft, vandalism, or other criminal acts.

While the other options present valid functions that security systems can have—such as announcing system status, notifying authorities, and providing operational feedback—these roles are secondary compared to the primary goal of using sound as a deterrent. The focus of audible notification appliances is to generate a noticeable alert that can help protect the property.