In multilevel inheritance, which is the most significant feature of OOP?

In multilevel inheritance, the most significant feature of Object-Oriented Programming (OOP) is code reusability. This mechanism allows a class to inherit properties and methods from another class, enabling the creation of new classes based on existing ones. Multilevel inheritance extends this concept by allowing a class to inherit from a child class, further promoting the reuse of existing functionality across multiple levels without rewriting code.