What is the benefit of using a Docker registry?

Using a Docker registry primarily serves the purpose of managing and distributing container images. A Docker registry is a repository where images can be stored and shared. This is crucial for maintaining consistency across development, testing, and production environments, allowing teams to collaborate effectively by pulling the same image versions or updates.

When developers create containerized applications, the images they build need a central place from which they can be easily accessed and downloaded. The registry facilitates this process, enabling users to push their images and others to pull them as necessary. This centralized management helps in version control, ensuring that teams can efficiently track changes and roll back to previous versions when required.

In contrast to the other options, which relate to aspects of performance, image building, or networking, the core function of a Docker registry is its role in the management lifecycle of container images. This makes option B the most relevant and critical benefit among the choices given, as it encapsulates the essential role that registries play in a well-organized containerization workflow.