How do you define an overlay file for a deployment to override the replica count to 5?

• A. replicas: 5 at the Deployment level in a manifest
• B. apiVersion: apps/v1 kind: Deployment metadata: name: myapp spec: replicas: 5
• C. spec: replicas: 5
• D. kind: Service metadata: name: myapp spec: replicas: 5

Answer: (B)

Overlays and patches modify specific fields of an existing resource, so you need a patch that clearly identifies which resource to change and what to change. To override the number of replicas for a Deployment, you patch the Deployment by including its identifying details and the new replica value under spec.replicas.

The YAML shown contains all the necessary parts: apiVersion and kind specify the resource type, metadata.name identifies the exact Deployment to modify, and spec.replicas sets the desired count to 5. This makes it a valid overlay patch for that Deployment, reliably applying the change to the correct resource.

The other options aren’t suitable because they’re incomplete, not patch-like, or refer to a different resource type (which doesn’t use replicas).