Each _______ shall be trained to know at least, the PPE is necessary; what PPE is necessary, how to properly don, type, in jurt of wear PPE; the limitation of PPE; and care of PPE.

The training described covers critical aspects of PPE, including when it's necessary, what type to use, how to properly don (put on), doff (take off), adjust, and wear it, its limitations, and its care. This knowledge is essential for anyone who directly uses PPE in the workplace.

• a) Chief Inspector: A chief inspector's role is typically to audit and enforce safety regulations, not primarily to receive training on the practical use of PPE for their daily work in the same way a worker does.
• b) Inspector: Similar to a chief inspector, an inspector's main function is oversight and compliance checking.
• c) Contractor: A contractor can refer to a company or an individual. If it's an individual performing work, they are essentially a worker and would need this training. If it's a contracting company, they are an employer, and their employees would need the training.
• d) The last option is partially obscured, but based on the context of the question and common safety regulations, it most likely refers to "Employee" or "Worker". Employees are the direct users of PPE and are legally required to receive this training.

In occupational safety and health, the responsibility for providing and ensuring that each employee who uses PPE receives comprehensive training on its proper use, care, and limitations is fundamental. Therefore, the individuals who shall be trained are the employees or workers. Assuming option (d) is "Employee" or "Worker", it is the correct answer.

The correct option is d).