During fueling operations, which of the listed precautions should be taken when topping of

During fueling operations, which of the listed precautions should be taken when topping off fuel tanks？

A.Reduce the pumping rate by closing the deck filling valve

B.Close all overflow valves

C.Place 5 gallon containers under all flange connections in the fuel line

D.Reduce the pumping rate and sound tanks frequently as the level rises

请帮忙给出正确答案和分析，谢谢！