Which of the following methods frequently delivers new code in an automatic way for development projects?

Automated testing is a component of CI/CD that runs tests automatically, but it is not the overarching method for automatically delivering code.

A CI/CD (Continuous Integration/Continuous Delivery or Deployment) pipeline automates the entire software release process from code commit through testing and deployment to production environments. This automation ensures that new code changes are continuously integrated into the main branch, tested, and reliably delivered or deployed, enabling rapid and frequent releases.

Validation checks are steps within the development and testing process to ensure code quality and adherence to requirements, but they do not describe the automated delivery of code itself.

'Deploy sprint' is not a standard industry term or method; a sprint is a timeboxed period in Scrum, and deployment is an activity, but not a combined method.