CKS Lab: Question about the registry whitelist

The question says:

What is the value passed to registry-whitelist parameter by the command running inside the webhook pods?

The correct answer is:

controlplane ~ ➜  k describe pod image-bouncer-webhook-56cd846c85-j9tpx|grep -i whitelist
      --registry-whitelist=docker.io,k8s.gcr.io

The answer close to this only says docker.io, so it’s incomplete.

regards
Vitor Jr.