Refactoring in software development refers to which of the following processes?

Refactoring in software development specifically involves restructuring existing code to improve its non-functional attributes such as readability, maintainability, and performance without altering its external behavior. This process aims to enhance the code’s structure and clarity, making it easier for developers to understand and work with in the future. By doing so, it helps reduce technical debt and can lead to fewer bugs and improved efficiency in further development efforts.

This understanding clarifies the primary goal of refactoring, which is about improving the internal structure of the codebase rather than changing the actual functionalities that the software provides to users. Other processes like modifying functionality or testing performance focus on different aspects of software development and do not constitute refactoring.