Which of the following best describes the term "duress alarm"?

The term "duress alarm" specifically refers to a silent alarm that is discreetly activated by an individual under duress, such as during a robbery or other threatening situation. This type of alarm is designed to alert security personnel or law enforcement without alerting the assailant that help has been summoned. Thus, it facilitates a quicker and more covert response to dangerous situations, enhancing the safety of the person in trouble.

The other options do not align with the definition of a duress alarm. An alarm activated by fire is primarily designed to alert occupants of a fire emergency, while an alarm for technical failures pertains to issues with systems or equipment, which is unrelated to personal safety in threatening circumstances. Lastly, an alarm for building evacuations is aimed at prompting evacuation for safety reasons, such as fire or other emergencies, instead of addressing personal threat situations like those that would activate a duress alarm.