Which of the following is NOT a component of physical security?

The correct choice is based on the definition of physical security, which encompasses the protection of physical assets from threats such as unauthorized access, theft, vandalism, and natural disasters. All the other components mentioned are direct measures used to safeguard physical environments.

Lighting plays a critical role in deterring unwanted intrusions by enhancing visibility around a property, making it easier to spot potential intruders. Intrusion detection systems are designed to alert personnel to unauthorized entry, thus providing immediate response capabilities. Locks are fundamental security features that physically prevent unauthorized access to buildings, rooms, or sensitive areas.

In contrast, data encryption is a method related to securing digital information, ensuring that data is unreadable without the correct decryption keys. It primarily addresses cybersecurity concerns rather than physical security measures. Therefore, it does not fit within the scope of components typically associated with physical security strategies.