Which security technology is commonly used to prevent unauthorized access?

The correct answer, alarm systems, plays a vital role in preventing unauthorized access to secured areas. These systems are designed to detect and alert security personnel or law enforcement of any attempted breaches or suspicious activities. Alarm systems often include sensors that trigger alerts when doors or windows are improperly opened, when motion is detected within a designated area, or when other security violations occur.

The capabilities of alarm systems extend beyond merely sounding an alarm; they often integrate with surveillance cameras and access control systems, enhancing overall security measures. By providing immediate notification of unauthorized access, alarm systems enable a timely response, potentially deterring intruders or reducing the risk of theft, vandalism, or other crimes.

While other security technologies have their own benefits—such as lighting systems, which can deter crime by illuminating areas to increase visibility, or manual locks, which provide physical barriers—they don't offer the same level of immediate notification and real-time monitoring that alarm systems do. Fire extinguishers, on the other hand, are primarily geared towards fire safety and not directly involved in access control. Thus, alarm systems stand out as a crucial tool in the prevention of unauthorized access.