Update a Deployment Manager deployment without resource downtime. Which gcloud command should you use?

The gcloud deployment-manager deployments update --config command is used to modify an existing Deployment Manager deployment. When you update a deployment, Deployment Manager attempts to apply the changes without deleting and recreating resources unless explicitly required by the configuration change, thereby minimizing downtime. The gcloud deployment-manager deployments create --config command is for creating new deployments, not updating existing ones. The gcloud deployment-manager resources create --config and gcloud deployment-manager resources update --config commands are incorrect because Deployment Manager operates on deployments, which are collections of resources, not individual resources directly via these commands.