The correct answer highlights the most prevalent and foundational types of security technology used in various environments to ensure safety and protect assets. CCTV (closed-circuit television) systems are critical for monitoring and recording events in real-time, helping to deter crime and provide evidence when necessary. Alarms play a significant role in signaling unauthorized access or breaches, alerting security personnel or law enforcement. Access control systems regulate who is allowed to enter specific areas, enhancing security through restricted entry. Intrusion detection systems are designed to identify unauthorized movements or breaches, ensuring rapid response to potential threats.
While the other options contain valid security technologies, they cater to more specialized aspects or different contexts of security. For instance, metal detectors and biometric scanners are important for specific locations like airports or secure facilities, but they do not encompass the broader range of security technology that is commonly utilized in various establishments. Similarly, locksmith services and security personnel training focus on physical security measures and human factors rather than technology itself. Lastly, encryption software and firewall systems pertain primarily to cybersecurity, which, while crucial, falls outside the traditional physical security technology commonly deployed in sites like businesses, schools, and public spaces.