What triggers the AWS CodePipeline processes?

AWS CodePipeline primarily automates the process of continuous integration and continuous delivery (CI/CD) for application development. The correct choice identifies that a code change based on the defined release model is a primary trigger for AWS CodePipeline processes. When code is modified—such as when a new commit is pushed to a source repository (like AWS CodeCommit, GitHub, or Bitbucket)—this change can initiate a pipeline execution. The release model, which determines how code changes are integrated and delivered, is a crucial factor since it defines the conditions under which the pipeline should react to these changes.

Other triggering methods exist, but they are secondary or situational compared to the direct impact of code changes on the pipeline lifecycle. For instance, manual initiation by a user or based on scheduled intervals can also start a pipeline, but the core functionality relies on code changes as the primary driver of automation in the CI/CD workflow. Additionally, successful completions of other AWS services can influence the flow within a pipeline but are not the fundamental trigger for initiating the pipeline itself.