Which technique uses detectors throughout a geographic area?

• A. Area Array
• B. Critical Node
• C. Monitor
• D. Observe

Answer: (A)

Wide-area sensing uses detectors spread across a geographic area to form an area array. By placing many sensors throughout the region, you can monitor activity anywhere in that area and often determine where a signal originates by comparing inputs from multiple detectors. This distributed coverage is the defining feature of this approach, enabling detection over large spaces rather than at a single point. The other terms describe more general watching or network analysis rather than deploying sensors across the landscape, so they don’t capture the essence of monitoring an entire geographic region.