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A person who is watching the loading or unloading of a tank must do all of the following, except

A Wear a chemical suit
The person in charge of loading or unloading a hazardous materials cargo tank must ensure that a qualified person is always supervising the process. The supervisor must be alert; have a clear view of the tank; be within 25 feet of the tank; know the hazards of the involved materials; know the procedures to follow in the case of an emergency; and be authorized to and capable of moving the tank.
B Remain alert
C Remain within 25 feet of the tank
D Know the hazards of the materials involved