Final answer:
Technician B is correct because using an OSHA-approved brake washer meets safety guidelines, whereas removing brake dust with compressed air can create a health hazard. Therefore, the correct option is b
Step-by-step explanation:
Technician B is correct because using an OSHA-approved brake washer to clean drum brake assemblies is a safe method that minimizes the release of brake dust into the air which can be harmful if inhaled. Whereas Technician A, who removes brake dust with compressed air, may inadvertently aerosolize harmful particles, potentially creating a health hazard. OSHA has specific guidelines to regulate workplace safety, which includes the proper handling of brake dust and using equipment like a brake washer to prevent air contamination.