Which item is primarily addressed by physical security?

• A. Firewall configuration
• B. Password policy
• C. Electrical power supply
• D. Antivirus updates

Answer: (C)

Physical security focuses on protecting tangible assets, facilities, equipment, and the environment in which information systems operate. It aims to prevent damage, theft, and disruption to the physical infrastructure that computers, networks, and data depend on, including ensuring continuous operation of essential power and environmental systems. The electrical power supply is fundamental to maintaining a secure, available environment; without reliable power—often backed by backup generators or uninterruptible power supplies—servers, security cameras, access control systems, and other critical hardware can fail, creating vulnerabilities and downtime.

By contrast, firewall configuration, password policy, and antivirus updates are measures aimed at safeguarding systems and data from unauthorized access and cyber threats, which fall under information or IT security rather than physical security.