Pick out the correct statement?

A. Risers are generally not connected to the plate in a distillation coloumn by bolts, rivets or welding

B. It is preferred to use a vertical condenser for condensation of vapor from a distillation column without sub-cooling

C. Random packing a packed tower offers the advantage of lower pressure drop and higher throughput of fluids as compared to regular/stacked packing

D. Draining of residual liquid on tray during shut down of distillation column is facilitated by weep holes

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