blunt7559 blunt7559 22-01-2024 Engineering contestada Which of the following three hazard classes should NOT be placed into a temperature-controlled trailer (one with a heater/air conditioner unit)?A. Classes 1, 2.1 and 3.B. Classes 1, 3 and 6.C. Classes 1, 3, and 4.D. Classes 1, 4, and 5.1.