The correct answer is d. all of the above.
Explanation:
While applying a coating of zinc (galvanization) is generally considered the most durable and effective method for preventing rust on an iron frying pan, both applying grease and paint can also offer some protection against rust. However, these methods are less durable and may not withstand the high temperatures used in cooking.
Applying grease:
Greasing the pan creates a barrier between the iron and oxygen/moisture, preventing rust. However, this coating needs to be reapplied frequently, especially after washing. The grease can also contaminate food.
Applying paint:
Paint can also act as a protective barrier against rust. However, paint can chip and peel off over time, especially with repeated heating. The paint may also release harmful chemicals into the food during cooking.
Applying a coating of zinc (galvanization):
This method involves coating the iron pan with a layer of zinc, which provides excellent protection against corrosion. Galvanization is considered the most effective and lasting solution for preventing rust on frying pans.