Final answer:
A safety net must extend not more than 5 meters below the work area.
Step-by-step explanation:
The correct answer is B) 5 meters below the work area.
Safety nets are used as a protective measure to catch falling objects or individuals. They are designed to absorb the impact of a fall and prevent serious injuries. According to safety regulations, a safety net must extend not more than 5 meters below the work area to ensure maximum safety.