What type of Agile testing focuses on validating software against business requirements?

The correct answer is acceptance testing because this type of testing specifically aims to validate the software against business requirements and user needs. Acceptance testing occurs at the end of the development process, before the software is delivered to the customer. It is crucial in ensuring that the final product meets the agreed-upon specifications and fulfills the user's expectations.

In acceptance testing, the focus is on the overall functionality and usability of the application, which involves checking whether the software behaves as intended in real-world scenarios. This alignment with business requirements makes acceptance testing a critical step in the Agile process, as it directly involves stakeholders and users who evaluate whether the software is ready for production.

Other forms of testing, such as unit testing, integration testing, and regression testing, serve different purposes. Unit testing targets individual components or functions to ensure they work correctly in isolation. Integration testing assesses the interaction between different modules or services, verifying that they work together as intended. Regression testing checks whether new changes lead to unintended side effects in the existing codebase after updates have been made. While all these testing types contribute to software quality, they do not directly focus on validating the product against business requirements as acceptance testing does.