In a flash-type evaporator, an electrical salinity cell would be installed in the __________.

Correct Answer: Option D — all of the above

Salinity cells monitor water quality throughout the distillation process. Placing them at the distillate outlet, inlet to the cooler, and condensate drains ensures comprehensive monitoring. This redundancy allows the system to detect contamination at any stage, triggering the dump valve to protect the ship's freshwater tanks from salt.