Question: Kotlin classes are final by default. What does final mean?

1. final means that you cannot use interfaces with this class.
2. final means that this is the only file that can use the class.
3. final means that you cannot extend the class.
4. final classes cannot be used in the finally section of a try/catch block.

Answer: The correct answer of the above question is Option C:final means that you cannot extend the class.