Question: Kotlin will not compile this code snippet. What is wrong?

1. In order to inherit from a class, it must be marked **open**
2. In order to inherit from a class, it must be marked **public**
3. In order to inherit from a class, it must be marked **sealed**
4. In order to inherit from a class, it must be marked **override**

Answer: The correct answer of the above question is Option A:In order to inherit from a class, it must be marked **open**