Which feature controls the duration of a scan?

• A. Ventilation rate
• B. Alarm threshold
• C. Power mode
• D. Scan delay

Answer: (D)

The element being tested is how long a scan lasts. The scan delay parameter sets the time window for data collection in a single scan, so increasing it makes each scan run longer and gather more data, while decreasing it shortens the scan duration. The other controls affect different aspects—ventilation rate changes airflow, alarm threshold sets when alerts trigger, and power mode changes energy use and device readiness—but none of these directly determine how long a scan takes.