The formation of solid crystals from a solution of its salt

The correct answer is: Crystallization

Crystallization or crystallisation is the process by which a solid forms, where the atoms or molecules are highly organized into a structure known as a crystal. Some of the ways by which crystals form are precipitating from a solution, freezing, or more rarely deposition directly from a gas. Attributes of the resulting crystal depend largely on factors such as temperature, air pressure.
The formation of solid crystals from a solution of its salt is crystallization.