Which surveillance technique uses detectors positioned within a geographic space to provide detection and early warning of a CBRN incident?

• A. Area Array
• B. Periodic
• C. Continuous
• D. Critical Node

Answer: (A)

This question is about how detectors spread across a geographic space enable early warning of CBRN incidents. An area array places multiple sensors throughout the area, not just at a single point, so the entire region is monitored simultaneously. This distributed setup allows any released agent or anomaly to be detected quickly by nearby sensors, and the collective data can be fused to identify and localize the event, triggering alerts sooner. The other concepts describe different approaches: periodic implies sampling at set times rather than continuous, space-wide coverage; continuous might refer to a single point or non-distributed monitoring; and a critical node focuses on key points rather than full-area coverage.