Which of the following is an example of a physical security measure?

Installing surveillance cameras at entrances exemplifies a physical security measure because it involves the use of tangible equipment to monitor and control access to a location. Physical security measures focus on protecting physical assets, such as buildings and facilities, through concrete barriers, surveillance systems, alarms, and access control systems. Surveillance cameras provide real-time monitoring and recorded evidence that can deter unauthorized access, assist in investigations, and enhance overall security.

In contrast, employee training on phishing is aimed at improving cybersecurity awareness, while the use of firewalls and implementing software updates pertain to digital security strategies, focusing on protecting information and systems from cyber threats. These options do not involve physical barriers or monitoring systems aimed at securing a physical space directly.