6 What is an arc flash protection boundary? O A. The distance from energized equipment at which a worker, unprotected by proper PPE, could receive an electric shock O B. The distance from energized equipment at which a worker, unprotected by proper PPE, would sustain burns less than those from a mild sunburn O C. The distance from energized equipment at which a worker, unprotected by proper PPE, would not be burned O D. None of these descriptions describe an arc flash protection boundary