What are three common methods of food preservation?

Canning, freezing, and drying are recognized as common methods of food preservation due to their effectiveness in extending the shelf life of various foods while maintaining quality and nutritional value.

Canning involves sealing food in airtight containers and then heating it to destroy microorganisms, effectively preventing spoilage. Freezing slows down enzyme activity that causes food to deteriorate, preserving texture, flavor, and nutrients for a prolonged period. Drying removes moisture from food, inhibiting the growth of bacteria, yeast, and mold, which allows for much longer storage without refrigeration.

The other methods listed in the options do not fully fit the criteria of common preservation techniques. Baking, for instance, is a cooking process rather than a method to extend shelf life. Pickling, while a preservation method, is a specific technique involving vinegar and does not encompass general preservation methods like drying. Lastly, salting and boiling may enhance flavor or safety but are not as broadly classified under food preservation methods as the chosen answer.