Final answer:
The Open-Close Principle (OCP) is about designing software entities to be open for extension but closed for modification. It allows for the addition of new features without changing existing code by using well-defined abstractions. The correct answer to the question is 'A. Yes'.
Step-by-step explanation:
The Open-Close Principle (OCP) is a fundamental concept in object-oriented software design which states that software entities like classes, modules, functions, etc., should be open for extension but closed for modification. This means that you should be able to add new functionality without changing existing code, thus avoiding the potential for introducing new bugs into already-tested features.
OCP is about having well-defined abstractions that provide a stable interface. While abstractions are important for OCP, the core idea is to enable extension of software behavior without modifying existing source code. This can often be achieved through the use of interfaces and inheritance in object-oriented languages, allowing for new functionalities to be added with minimal impact on the existing system.
The correct answer to the question is 'A. Yes', the open-close principle is indeed about having well-defined abstractions to make extension easy without affecting existing functionality.