A vessel is equipped with cross-connected deep tanks. In which situation should the cross-connection valve be closed?

A、Thetankslieabovethewaterlineandarefilled
B、Thetanksarepartiallyfilledwithdrycargo
C、Thetanksarepartiallyfilledwithliquidcargo
D、Thetanksarefilledandliebelowthewaterline