Why is the use of iodised salt advised?

Why is the use of iodised salt advised ?
A. 1) It is advised to use iodised salt to prevent goitre (enlargement of the thyroid gland).
2) Iodine is required for the proper functidttiftg of thyroid.
3) Iodine stimulates the thyroid gland t&’produce thyroxin hormone.
4) This hormone regulates carbohydrate, fat and protein metabolism in our body.