Explanation:

Here’s how it shakes out:

- Hard Drive: This is a modified product. Manufacturers take parts, tweak designs, and add features to fit market needs or improve performance.

- Steel: Classic example of a modified product. Iron goes through processes—adding carbon, heating, rolling—to become various types of steel.

- Paint: Another yes. Paint manufacturers adjust formulas, colors, and finishes all the time to suit different uses and preferences.

- Medicine: Not the same category. Medicine is considered a “pure” product—formulated wholly for a medical purpose, regulated as a standalone good, not typically seen as a mere variation or improvement on an existing market product.

So the correct answer is:

Option 4 – Medicine