Answer:
PPE is considered the last line of defense to protect researchers on the hierarchy of controls.
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PPE (Personal Protective Equipment) is the final level in the hierarchy of risk control to protect the workers.
Hierarchy of risk control is the implementation of the safety system, which reduces the risk of hazards and illness at the workplace.
There are five levels in the hierarchy that are Elimination, Substitution, Engineering controls, administrative controls and the last one is PPE.
PPE is considered as the last level of the protection in the model of risk control.
Learn more about the hierarchy of controls here:-
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