Final answer:
Unit testing is the most effective method for testing input validation and data validation in a web application, while Acceptance testing can also be useful for checking overall functionality. Fuzzing may not be as effective for specifically testing input and data validation.
Step-by-step explanation:
The most effective testing method for testing input validation and data validation in a web application would be Unit testing. Unit testing is a method of software testing where individual units or components of a program are tested. In this case, Logan can create tests to check if the input validation and data validation features of the web application are working as expected.
Acceptance testing can also be useful in this scenario to ensure that the web application meets the specified requirements and is ready for deployment. This type of testing focuses on the overall functionality and usability of the application.
Fuzzing, while useful for uncovering vulnerabilities in software, may not be the most effective method for specifically testing input and data validation.