Continuous surveillance techniques are characterized by

• A. Frequent checks
• B. Given geographic space
• C. Uninterrupted checking
• D. Early warning

Answer: (C)

Continuous surveillance means monitoring a target or area without any gaps in time, so observation is ongoing and uninterrupted. This persistent view allows immediate detection of changes or movements as they happen, which is why uninterrupted checking is the best description. If you relied on frequent checks, there could be pauses between observations, breaking continuity. Describing the surveillance as covering a given geographic space focuses on where you’re watching, not how continuously you’re watching. And labeling it for early warning speaks to the outcome or function (alerting) rather than the way observation is conducted.