Final answer:
PPE (Personal Protective Equipment) is not considered an engineering control; it is instead an administrative control providing personal protection where engineering solutions are infeasible or incomplete.
Step-by-step explanation:
The option that is not considered an engineering control is d. PPE (Personal Protective Equipment). Engineering controls aim to eliminate or reduce exposure to a hazard through the design or modification of facilities, equipment, or processes. Examples of engineering controls include air scrubbing, containment, and dust suppression, which are designed to physically remove or reduce the hazard before it comes into contact with workers. PPE, on the other hand, is a type of administrative control that serves as a last line of defense to protect the individual when engineering controls are not feasible or do not completely eliminate the hazard.