Question: What is meant by the term "polyfill" when used in web development?

1. It is a piece of code that provides modern functionality in browsers that do not support it.
2. It is a piece of code that hides broken content from old browsers.
3. It is a term for languages such as Saas that compliles to CSS.
4. It is a script that runs to add vendor prefixes to modern CSS.

Answer: The correct answer of the above question is Option A:It is a piece of code that provides modern functionality in browsers that do not support it.