Which statement best describes active surveillance versus zone-based scanning in aquatic environments?

Which statement best describes active surveillance versus zone-based scanning in aquatic environments?

• A. They are the same approach.
• B. Active surveillance is continuous wide-area monitoring; zone-based scanning divides the facility into sections and assigns focal attention to each zone.
• C. Active surveillance focuses on one zone at a time.
• D. Zone-based scanning ignores the entire facility.

Answer: (B)