Which of the following represents the steps needed to produce crystals from a solution?

From a solution of zinc sulfate, we have excess zinc in a solution and need to form pure crystals. 


**Possible methods:**  

A- Filter, concentrate the solution, evaporate to crystallization point.  

B- Filter, evaporate to crystallization point, distill. 


**My thoughts:**  

In choice A, how can we concentrate the solution (without heating it) if there already is some excess zinc? And in choice B, the last step (distillation), do they mean that we will heat the mixture of crystals and un-crystallized solution so the solution will evaporate and we will be left with the crystals? Wouldn't that remove some of the water of crystallization of the crystals too?


