Final answer:
The correct source to recommend types of ventilation to reduce welder exposure to welding fume is company health and safety policies.
Step-by-step explanation:
The correct answer is b) Company health and safety policies.
CSA Standard W117.2 is a standard for the safety in welding, cutting, and allied processes, but it is not specifically focused on ventilation recommendations for reducing welder exposure to welding fume.
The Occupational Health and Safety Act (OSHA) is a legislation that sets standards and regulations for workplace safety, but it does not provide specific ventilation recommendations for welder exposure.
Company health and safety policies, on the other hand, are specific to the workplace and can include guidelines and recommendations for ventilation systems to reduce welder exposure to welding fumes.