Options B and D are correct because they utilize Cloud Functions and Cloud Run, which are serverless products, and leverage Cloud Build for CI/CD, reducing overhead. Options A, C, and E are incorrect due to reasons such as the use of non-serverless products (Compute Engine), the inability of Cloud Source Repositories to act as a CD tool, and the higher overhead associated with managing Jenkins on GCP compared to Cloud Build. References: Cloud Build Overview, Automating Builds with GitHub App Triggers, Jenkins on Kubernetes Engine Tutorial.