You must move a production project from another organization's Google Cloud into your organization and bill it to your org with minimal effort. What should you do?

The projects.move API method is the correct and most efficient way to transfer a project between organizations. After moving the project, you must update its billing account to your organization's billing account to ensure proper billing. This two-step process minimizes effort and downtime. Obtaining Organization Administrator IAM and using the UI is incorrect because projects cannot be moved between organizations directly via the Resource Manager UI; it requires the API. Exporting as a Private Catalog item or using Terraform to redeploy resources would involve significant effort, potential downtime, and would not preserve the project ID or existing configurations, which is contrary to the "minimal effort" requirement.