Your organization wants to protect its supply chain from attacks.

To secure a container supply chain, you need two things: Visibility (Scanning) and Enforcement (Policy). Google Cloud provides Artifact Analysis (integrated with Artifact Registry) and Binary Authorization to solve this.

According to Google Cloud Documentation (Software Supply Chain Security):

"To secure your supply chain, use Artifact Registry with automatic vulnerability scanning to identify risks in your images. Then, use Binary Authorization to define a policy that requires images to be signed by trusted authorities (attestors) before they can be deployed to GKE or Cloud Run. This ensures that only images that have passed your security checks (like vulnerability scans) are allowed to run."

How it works:

Scanning: Every time an image is pushed to Artifact Registry, it is automatically scanned for CVEs.

Attestation: A successful scan (e.g., no 'Critical' vulnerabilities) triggers a CI/CD step to "Sign" the image (create an attestation).

Enforcement: The GKE admission controller (Binary Authorization) checks for this signature. If it's missing or invalid, the deployment is blocked.

Why other options are incorrect:

A is incorrect: Container Threat Detection is for runtime (after it's already running). Supply chain security is about pre-deployment prevention.

B is incorrect: While Grafeas/Kritis are the open-source foundations, Option D represents the managed Google Cloud services which "minimize management overhead."

C is incorrect: Firewalls inspect network traffic, not the integrity or vulnerability status of the container image itself.