A systems administrator is working on a solution with the following requirements: • Provide a secure zone. • Enforce a company-wide access control policy. • Reduce the scope of threats. Which of the following is the systems administrator setting up?

Zero Trust is the correct answer because its core principles directly address all the requirements. It operates on the "never trust, always verify" model, meaning no user or device is trusted by default, regardless of whether they are inside or outside the network perimeter. This creates a secure zone by continuously authenticating and authorizing access, enforcing company-wide access control policies at a granular level, and significantly reducing the scope of threats by limiting potential lateral movement and impact of a breach. AAA (Authentication, Authorization, and Accounting) is a foundational security concept but is a component within a Zero Trust architecture, not the overarching solution itself. Non-repudiation ensures that a party cannot deny having performed an action, which is a security goal but doesn't encompass creating a secure zone or enforcing access policies comprehensively. CIA (Confidentiality, Integrity, Availability) is a security triad representing fundamental security objectives, not a specific architectural solution for enforcing policies or creating secure zones.