Final answer:
Network access control (NAC) falls under Operational security, which is answer B.
Step-by-step explanation:
The question 'Which of the following security areas encompasses network access control (NAC)?' relates to the field of network security within information technology.
The correct answer to this question is B. Operational security. Operational security involves the controls and procedures that are designed to protect data, information systems, and the infrastructure of a network.
Network access control (NAC) is a critical component of operational security as it restricts the availability of network resources to the users that are granted access. It helps in preventing unauthorized access and ensuring that only compliant and authenticated users and devices are allowed on the network.
Regarding the review question on food security, 'Transformation' is not one of the four pillars of food security. The four pillars are Availability, Access, Utilization, and Stability. These are the main areas focused on when ensuring that all people, at all times, have physical, social, and economic access to sufficient, safe, and nutritious food.
NAC helps in protecting network resources by ensuring only authorized access. Meanwhile, 'Transformation' is not one of the four pillars of food security.