Use C for this item. Using one badge to let multiple employees enter a building is a physical access control violation. Badge readers, locks, turnstiles, guards, and visitor procedures are meant to identify and authorize each person entering a protected facility. In Cisco CCNA 200-301 v1.1, Security Fundamentals questions frequently test the practical boundary between similar features: what the feature does, where it is configured, and what problem it is meant to solve. Network authorization and intrusion detection are logical controls, and user awareness is training rather than the violated access-control mechanism itself. A clean way to validate the answer is to map the wording of the scenario to the actual device function. If the feature supplies addressing, forwarding, authentication, trunking, route selection, or controller communication, the answer must match that function exactly rather than a nearby protocol name.