Critical Infrastructure security focuses on the physical and cyber systems that are vital to which country?

• A. The United States
• B. Canada
• C. United Kingdom
• D. Australia

Answer: (A)

Critical Infrastructure security centers on protecting the physical and cyber systems that a country needs to function. These are the essential services and assets—like power grids, water, transportation, communications, healthcare, and financial networks—that, if disrupted, would cause serious harm to national security, the economy, or public safety. In the security literature and policy frameworks used for this material, the formal definition and emphasis come from the United States, where such infrastructure is defined as critical because its incapacitation would have severe national consequences. That’s why the best answer points to the United States. Other countries have similar ideas, but the US-centric framing is what this context expects.