Kevin knows that regression testing is necessary but wants to prevent old versions of code from being re-inserted into new releases. What process should he use to solve this problem?

Kevin should implement a version control scheme and make sure that the proper current version of software components is included in new releases and deployments. Developers can still manually reintroduce old code, but version numbering helps to ensure that you have a current version in use. Neither continuous deployment nor continuous integration will prevent old code from being inserted, and release management may depend on version numbering but won’t prevent it by itself.