Final answer:
Work must be conducted at least 6 inches inside a laminar flow hood to ensure a sterile environment by avoiding airflow disruptions and potential contamination. Therefore the correct answer is Option 2.
Step-by-step explanation:
All work done in a laminar flow hood must be at least 6 inches inside the hood. This distance is recommended to prevent airflow disruptions and potential contamination from the room environment. The laminar flow hood is designed to create a sterile environment by using a constant flow of air filtered through high-efficiency particulate air (HEPA) filters. Anything placed too close to the front of the hood could obstruct the airflow and compromise the sterile field.