Which combination of technologies satisfies all requirements: open-source portability, dynamic compute scaling, continuous delivery, multiple segregated stacks, template-based deployments, and URL-based service routing?

Google Kubernetes Engine (GKE) provides open-source portability (Kubernetes is open-source), dynamic compute scaling, and supports multiple segregated stacks through namespaces. Helm enables template-based deployments and manages Kubernetes application lifecycles. Jenkins facilitates continuous delivery (CI/CD pipelines). URL-based service routing is handled by Kubernetes Ingress resources, often combined with GKE's native load balancing. The other options are less complete. "GKE and Cloud Load Balancing" lacks continuous delivery, template-based deployments, and a clear mechanism for segregated stacks beyond basic GKE features. "GKE and Cloud Deployment Manager" offers template-based deployments but misses continuous delivery and is less focused on application packaging than Helm. "GKE, Jenkins, and Cloud Load Balancing" is close but lacks Helm's specific capabilities for template-based deployments and application package management within Kubernetes.