The correct options are Trigger events that start the workflow, A workflow definition written in YAML, and An action metadata file for a custom action.

You need Trigger events that start the workflow because GitHub Actions executes workflows in response to events such as push or pull request and without an event the workflow will never start.

You also need A workflow definition written in YAML because the YAML file in the .github/workflows directory defines the events, jobs, and steps that describe what to run and when to run it.

Since the team plans to include a custom action in the repository, they must provide An action metadata file for a custom action. This is the action.yml or action.yaml file that declares the action name, inputs, outputs, and the runtime so that the workflow can use the action.

The option Artifact Registry is not required for GitHub Actions to run. A registry can be used to store images or artifacts but it is optional and not a prerequisite for triggering or executing workflows.

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