What writing an Apex class, a developer warts to make sure thai all functionality being developed Is handled as specified by the requirements. Which approach should the developer use to be sure that…

Creating a test class allows developers to write specific test methods that invoke the business logic of the Apex class with controlled data, assert expected outcomes, and ensure the code works according to specifications and requirements.

Including a savepoint and Database.rollback is primarily for transaction control during runtime and doesn't inherently validate the overall business logic against requirements.

Including a try/catch block is for error handling within the Apex class and does not validate the functional correctness of the business logic.

Running code in an Execute Anonymous block is for ad-hoc testing or script execution, not for systematic validation and verification against requirements or ensuring repeatable test coverage.