Individuals using hazardous materials for personal use are not exempt, but hobbyists can be exempt under certain conditions.
Technician A is incorrect because individuals using hazardous materials for personal use are not exempt from the final rule. On the other hand, Technician B is partially correct as hobbyists using hazardous materials are exempt if they do not exceed spraying two vehicles per year under the final rule.
Therefore, the correct answer is D) B only.
https://brainly.com/question/28136675