PMP Exam Simulator

You are overseeing the implementation of a new functionality to the scanning system for a client. The client is the company that runs a chain of supermarkets in New Jersey. They want you to add a new feature to their barcode scanning system which will show the expiration date of a product along with other information. You have to make sure that the new functionality will not break existing features of scanning devices and that these changes are evaluated across all relevant versions of the product. Which one of the following will you use for that purpose?