Which of the following belongs to the Technical Security Control Families?

The correct answer highlights one of the key aspects of technical security control families. Access Control (AC) is an essential part of the technical security controls because it involves mechanisms that restrict access to information and resources. This ensures that only authorized individuals can access sensitive data, thereby helping to maintain confidentiality, integrity, and availability.

Access Control encompasses various techniques and protocols, including authentication methods, authorization processes, and the enforcement of policies that govern who can interact with systems and data under what circumstances. This control directly impacts the security posture of an organization by preventing unauthorized access and protecting against various forms of cyber threats.

In contrast, Risk Assessment (RA) and Security Assessment and Authorization (CA) are more aligned with management and operational controls rather than technical ones. These processes involve the evaluation of risks and the framework for ensuring compliance and authorization but do not provide direct technical mechanisms for securing data or systems. System and Communications Protection (SC), although it deals with specific technical measures, falls under a broader category and is not the primary focus area for access control which is foundational to technical security measures.