Final answer:
Lighting tracks that are 6 feet or less in length must be fastened at a minimum of two places to ensure safety and stability.
Step-by-step explanation:
The question pertains to the industry standards or codes related to the installation of lighting tracks. The correct answer is B. 6, meaning that lighting tracks that are 6 feet or less in length must be fastened at a minimum of two places. This ensures that the lighting track is securely attached and safe to use, preventing it from becoming a hazard due to falling or being unstable.
Proper installation of lighting tracks involves understanding how distance affects the number of fastening points required. A line of one foot to a line of six feet all fall under the requirement of at least two fastening points. It is implied that anything longer than six feet would require additional fastening points.