Which system is described as the most secure?

• A. The single badge system.
• B. The exchange badge system.
• C. The no-badge system.
• D. The universal badge system.

Answer: (B)

Access control works best when privileges are tightly scoped, time-limited, and traceable. The exchange badge system achieves this by issuing a zone-specific credential at each point of entry. Rather than carrying one master card that grants broad access, a person’s badge is swapped for a temporary credential that only permits entry to the current area or purpose. This containment means that if a badge is compromised, the window of opportunity is limited to the duration of that exchange and the restricted scope of that zone. It also creates a clear audit trail of who exchanged what and when, enabling accountability and easier revocation if needed. In contrast, a single badge carries all privileges, a no-badge approach provides little tangible security, and a universal badge would grant access across many areas, increasing the risk if compromised.