Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

• A. Tube dia is 3-6 cms, while tube length in 3-6 metres.
• B. Steam is fed to the shell, whereas the liquor is filled inside the tube.
• C. Liquor level is maintained at l/3rd to 1/2 of the height of the tube.
• D. none of these.