Which of the following best describes a "message" in a One-Way Voice Communication System?

A "message" in a One-Way Voice Communication System is best described as a pre-recorded audio prompt or live announcement because it encompasses both forms of communication utilized within the system. Such a system is designed to relay important information clearly and effectively, either through live broadcasts or by using pre-recorded messages that convey critical instructions or alerts. This versatility allows for immediate dissemination of information, which is vital for ensuring the safety of building occupants in emergency situations.

This definition encompasses the essence of how the system operates, with the focus on auditory communication aimed at a broad audience. The ability to use either live or pre-recorded messages enhances the responsiveness and effectiveness of communication during emergencies.