The correct answer is AWS CodePipeline because it is specifically designed to orchestrate and automate the steps required to release software changes frequently and reliably, including the scenarios in which code is automatically processed upon updates. While AWS CodeBuild and AWS CodeDeploy are part of the CI/CD process, they do not offer the end-to-end automation of code updates from version control systems to deployment as a standalone service. Amazon S3 is a storage service and does not handle automation of build, test, and deployment workflows.