Rusting of iron can be prevented by:

Both Option 1 and Option 2 are correct

The correct answer is option 3. Both Option 1 and Option 2 are correct.

Rusting of iron can indeed be prevented by both options:

1. Applying paint: Painting iron surfaces creates a barrier that prevents direct contact with moisture and oxygen in the air, which are necessary for the rusting process to occur. The paint layer acts as a protective coating, preventing the iron from undergoing oxidation.

2. Applying a thin layer of more reactive metal than iron: This process is known as galvanization. A thin layer of a more reactive metal, such as zinc, is applied to the surface of the iron. The zinc layer acts as a sacrificial anode, corroding preferentially to protect the iron underneath. This method is commonly used in galvanized iron products, such as galvanized steel pipes and sheets, to prevent rusting.

Therefore, both options are effective ways to prevent rusting of iron.