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Bruno is a technician at a university chemistry lab and is in charge of safety inspections and prevention of injury due to faulty equipment. one morning, as a result of his inspection, bruno discovers a gas burner with a broken valve. bruno gets distracted and fails to put an "out of order/do not use" sign on the faulty burner. when the morning class arrives, halle uses the faulty burner and is burned when it catches fire. bruno's negligence is based on