Which of the following lists all CBRN surveillance techniques?

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

Answer: (A)

CBRN surveillance relies on multiple modalities to ensure full coverage in time, location, and network robustness. The complete set includes Periodic surveillance, Continuous surveillance, Critical Node surveillance, and Area Array surveillance. Periodic surveillance provides scheduled checks that catch threats over time; Continuous surveillance offers real-time or near-real-time monitoring for rapid warning. Critical Node surveillance targets key locations in the detection network where monitoring is most impactful, ensuring that important points don’t become blind spots. Area Array surveillance uses dispersed sensor coverage to capture signals across a broad region, preventing gaps in spatial detection. Only that combination includes all four essential approaches; the other options omit at least one modality, making them incomplete.