Examples of a hazard control along the path:

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The question asks which options represent hazard controls along the path. 
Option a: Providing exhaust. This is an engineering control aimed at removing or reducing hazard exposure from the source by ventilating and exhausting contaminated air, which acts along the path of exposure. 
Option b: Encasing the hazard or hazardous process. Enclosure or shielding physically isolates the hazard, preventing exposure as the hazard travels along its path, so this is clearly a hazard control along the path. 
Option c: Organizational measures (e.g., only competent workers are permitted to do the specified work). This reflects administrative/organizational controls that modify how work is performed, reducing exposure risks along the work path by controlling access and procedures. 
Option d: Answers (a), (b) and (c). Since A, B, and C are all valid hazard controls along the path, this combined option correctly identifies the set of controls described. 
Option e: Personal protective equipment (PPE). While PPE is a protective measure, it is worn by the worker and does not eliminate the hazard along its path; it acts after exposure risk exists, serving as a barrier rather than removing or containing the hazard itself. This makes PPE a less fitting example of an on-path control compared to the engineering and organizational controls in A–C. 
In summary, A and B provide physical means to remove or contain the hazard along its path, C reduces exposure through work practices and authorization, while E (PPE) is protective equipment used by individuals rather than a control that intercepts the hazard along its path. Therefore, the option that captures all correct on-path controls is D.

EHS576 Quiz for WHMIS non-lab training

Examples of a hazard control along the path:

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