Final answer:
User acceptance testing (UAT) is the process where function, usability, and scenarios are tested against known base requirements, typically by final users to ensure the software meets their needs and specifications. Option number C is correct.
Step-by-step explanation:
The software development process in which function, usability, and scenarios are tested against a known set of base requirements is known as User acceptance testing (UAT). UAT is a crucial phase where final users or clients test the software to ensure it can handle required tasks in real-world scenarios, according to the agreed specifications. It typically serves as the final step before the software goes live and is conducted after the system and integration testing phases. The main purpose of UAT is to validate the end-to-end business flow; it does not focus on cosmetic errors, spelling mistakes, or system testing.
User acceptance testing is different from security regression testing, which ensures that new code changes do not adversely affect the existing security features. It is also distinct from code review, which is an examination of the source code by developers to find mistakes overlooked in the initial development phase, and stress testing, which evaluates how the system behaves under extreme conditions.