Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）<br>A:Each vent for the tank must be equal to the area of the tank filling line<br>B:The tanks must be protected by overflows<br>C:The total area of the vents or the overflow shall be at least equal to the area of the fill line<br>D:There must be twice as much vent area as the area of the fill line

Which statement is TRUE concerning protection of double bottom tanks against excessive pressure? （）
A:Each vent for the tank must be equal to the area of the tank filling line
B:The tanks must be protected by overflows
C:The total area of the vents or the overflow shall be at least equal to the area of the fill line
D:There must be twice as much vent area as the area of the fill line

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