Which of these providers host repositories of container images?

Docker Hub is the world's largest public repository of container images, providing a cloud-based registry service where users can find, store, and share Docker images.

GitHub is primarily a platform for version control using Git, hosting source code repositories, though it can host container images through GitHub Container Registry.

Container Index is not a widely known or standard term for a container image repository provider.

GitLab is an integrated platform for the software development lifecycle, including Git repositories and a built-in container registry, but Docker Hub is more exclusively known for general public image hosting.