What does the term 'code reusability' imply in OOP?

• A. Writing duplicate code for efficiency
• B. Encapsulation of code to restrict access
• C. Using existing code in new applications
• D. Refactoring old code to improve performance

Answer: (C)

The concept of 'code reusability' in Object-Oriented Programming (OOP) primarily refers to the practice of using existing code in new applications, which aligns perfectly with the correct choice. This practice promotes efficiency and consistency, as developers can leverage previously tested and validated code components rather than writing new code from scratch. By utilizing existing code, such as classes and functions, developers can save time, reduce errors, and maintain a more organized codebase.

Additionally, code reusability fosters better maintenance and scalability of software projects. For instance, if a particular functionality is encapsulated within a class, that class can be instantiated and used across different parts of the application or even in new projects. This leads to a more modular approach to software design, where components can be independently updated or replaced without affecting the entire system.

The other options highlight concepts that do not directly represent the idea of code reusability. Writing duplicate code for efficiency contradicts the very essence of reusability, as it leads to redundancy rather than efficiency. Encapsulation involves protecting the state of an object by restricting access, which is more about the integrity of data than about reusing code. Refactoring old code is related to improving it for better performance but does not inherently suggest