You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE?

A
Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned.
B
The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank.
C
The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue.
D
Steam cleaning and water washing are both capable of generating electrostatic charges within a tank.
E