What is the minimum required sound level for audible alarm notification devices?

The minimum required sound level for audible alarm notification devices is critical in ensuring that alarms can effectively alert individuals in an emergency situation. The correct answer is based on the standard requirements that dictate the sound levels need to reach a certain threshold to be heard over background noise in various environments. Audible alarms must produce sufficient decibel levels to be perceived clearly and to prompt a quick response from occupants.

In this case, the specified sound level in the correct option aligns with guidelines established by safety standards, such as those outlined in the National Fire Protection Association (NFPA) regulations. These standards typically recommend a sound level that ensures audibility throughout the entire area where the alarm is installed, factoring in potential ambient noise that could interfere with the perception of the alarm signal.

Other options may not fulfill these requirements as effectively, making them less suitable for ensuring safety and compliance with fire alarm regulations. Therefore, adhering to the standards outlined in the correct option ensures that alarm systems function as intended, providing an effective warning to individuals in any given environment.