Which of the following is an example of a distributed recipient mass notification system (DRMNS)?

• A. Reverse 9-1-1
• B. Public address
• C. Broadcast email
• D. SMS alerts

Answer: (A)

A distributed recipient mass notification system is built to reach a large number of people quickly across a geographic area, typically using automated outreach through multiple channels. Reverse 9-1-1 fits this idea because it automatically contacts residents within a defined area—calling or texting them with warnings or evacuation instructions—so many recipients in the target zone receive the alert at once. Public address, by contrast, is usually confined to a single building or site and doesn’t reach dispersed audiences in a region. Broadcast email and SMS alerts are individual-channel communications, not by themselves a complete system for area-wide, automated delivery, whereas reverse 9-1-1 embodies the geographic targeting and mass reach that DRMNS is all about.