Final answer:
The Interface Segregation Principle (ISP) is better for design because it enhances scalability, facilitates code reusability, and simplifies debugging processes by creating fine-grained, client-specific interfaces that reduce coupling between classes.
Step-by-step explanation:
The design using the Interface Segregation Principle (ISP) is considered better primarily because it enhances scalability through interface segregation. The ISP is one of the five SOLID principles of object-oriented design, which recommends that no client should be forced to depend on methods it does not use. This leads to the creation of more fine-grained interfaces that are client-specific, rather than larger, more general-purpose interfaces.
By adhering to the ISP, software designers can reduce the coupling between classes, which makes the system easier to refactor, change, and redeploy. It also facilitates code reusability, as smaller, more focused interfaces can be combined in various ways to create new functionality without duplication of effort. Furthermore, focused interfaces simplify the debugging processes since there are fewer intertwined dependencies to consider when something goes wrong.
Overall, while all the options listed have their own merits, enhancing scalability through interface segregation (Option 4) reflects a core benefit of the ISP, which subsequently improves code maintainability and adaptability in software development.