Which of the following methods can off-campus workers use to communicate security emergencies?

The answer is based on the fact that off-campus workers facing security emergencies need reliable and quick methods to communicate their situations effectively. Duress alarms are built specifically for emergencies, allowing workers to signal for help quickly and discreetly. Lone-worker devices are specialized tools designed to ensure the safety of employees who might be working alone, providing both alerts and potential location tracking to enhance response times. Blue alarm lights serve as visual indicators for emergencies, helping to draw attention to the situation swiftly.

These components are crucial for maintaining safety in an environment where immediate assistance may not be directly available, emphasizing a robust response system capable of mobilizing support in various scenarios. Meanwhile, other communication methods listed, like two-way radios or cell phones, while valuable, may not possess the rapid response and targeted functionality that duress alarms and lone-worker devices offer in critical situations.