Which term best describes a signal indicating an emergency requiring immediate action?

• A. Abnormal Conditions
• B. Automatic
• C. Central Station
• D. Alarm Signal

Answer: (D)

An alarm signal is the term that signals an emergency requiring immediate action. An alarm is specifically designed to provoke a rapid response, often triggering audible or visual alerts, evacuation steps, or automatic safety actions to protect people and equipment. The other terms describe different ideas: an abnormal condition is simply a deviation from normal operation without necessarily prompting urgent action; automatic refers to how a system operates (without manual input) rather than the urgency of the message; and central station points to where signals are received or monitored, not the nature of the alert itself. So the alarm signal best fits the idea of an urgent cue that action is needed right away.