Which of the following is an example of physical security?

The correct choice highlights the importance of measures taken to protect physical locations and assets. Physical security encompasses actions that are aimed specifically at safeguarding tangible equipment, facilities, and personnel. Using locks, access controls, and surveillance systems are all integral components of physical security. Locks prevent unauthorized access to physical spaces such as buildings and rooms, while access controls ensure that only authorized individuals can enter certain areas. Surveillance systems, such as cameras, help monitor activities and detect potential security breaches in real-time.

On the other hand, the other options focus on protecting data and information systems rather than physical environments. Antivirus software and firewalls serve to protect computers and networks from malicious attacks, while data encryption techniques safeguard information confidentiality during transmission or storage. These measures, although vital for cybersecurity, are fundamentally different from physical security measures that are aimed at preventing unauthorized physical access and ensuring the safety of physical assets.