A. Incorrect.
App Engine can serve applications, but it is not the lowest-overhead pattern for global image delivery.

B. Incorrect.
Persistent Disk and Compute Engine add VM cost and management overhead.

C. Incorrect.
Transfer Appliance is for offline transfer, not serving application images.

D. Correct.
Cloud Storage provides cost-effective object storage and Cloud CDN reduces latency for repeated image requests.

A. Correct.
Traffic Director with sidecar proxies provides service discovery, load balancing, and resilience across service backends.

B. Incorrect.
Proxyless mode is not the intended fit for this legacy sidecar-based connectivity requirement.

C. Correct.
The legacy service firewall must allow the health check path used by the sidecar/proxy-based solution.

D. Incorrect.
The application container is not the health-check source in the sidecar pattern.

E. Incorrect.
DNS round robin does not provide the same health-aware traffic management.

A. Incorrect.
Print statements add noise and require invasive code changes.

B. Incorrect.
Log timestamp analysis is brittle and does not show CPU and memory hot paths cleanly.

C. Incorrect.
Trace is useful for distributed latency, but Profiler is better for CPU and memory function hotspots.

D. Correct.
Cloud Profiler provides low-overhead profiling and flame graphs for supported runtimes such as Go.

A. Correct.
Cursor-based pagination with limits reduces documents read and memory retained by each Cloud Run request.

B. Incorrect.
Indexes help query performance, but they do not limit result size or memory pressure.

C. Incorrect.
Offsets still require skipped documents to be processed and are less efficient than cursors.

D. Incorrect.
More memory can mask the problem but does not reduce Firestore reads or response size.

A. Incorrect.
Project-name parsing is fragile and depends on naming conventions.

B. Correct.
Project-wide metadata cleanly provides environment configuration to instances with minimal per-instance setup.

C. Incorrect.
Running separate tooling in every project adds unnecessary management overhead.

D. Incorrect.
Hard-coded images reduce reuse and make promotion between environments harder.

A. Incorrect.
Docker Compose does not emulate Kubernetes deployment behavior closely enough.

B. Incorrect.
Terraform and kubeadm are heavier than needed for fast local app iteration.

C. Correct.
Minikube provides a lightweight local Kubernetes cluster and Skaffold automates build/deploy/test loops.

D. Incorrect.
kaniko and Tekton are better suited for cluster-based build and pipeline execution, not minimal local development.

A. Incorrect.
gsutil does not read NFS shares and adds brittle startup behavior.

B. Correct.
A PersistentVolumeClaim lets the Pod access external storage, and the entrypoint can start only after required configuration is present.

C. Incorrect.
Baking configuration into an image makes updates and environment-specific configuration harder.

D. Incorrect.
A Kubernetes Service provides networking, not file storage.

A. Incorrect.
Deployments are best for stateless replicas and do not provide stable per-replica identity and storage by default.

B. Correct.
StatefulSets provide stable Pod identities and stable storage for each replica.

C. Incorrect.
ReplicaSets maintain replica counts but are not designed for per-instance identity and storage.

D. Incorrect.
ReplicaControllers are older primitives and do not solve stable identity and persistent disk requirements.

A. Incorrect.
Signed URLs are for limited access to specific resources, not general API authentication.

B. Correct.
Attached service accounts with Application Default Credentials avoid distributing long-lived keys to instances.

C. Incorrect.
P12 key files are long-lived credentials and are not recommended.

D. Incorrect.
Shared JSON keys increase leakage and rotation risk.

A. Correct.
Cloud Source Repositories integrates with Google Cloud IAM, and trunk-based development supports frequent small merges.

B. Incorrect.
Long-lived feature branches increase merge conflicts and slow release cycles.

C. Incorrect.
Occasional mirroring weakens integration and long-lived branches conflict with the fast-release goal.

D. Incorrect.
Manual uploads are not a proper version control workflow.