In OCI, which areas are standardized?

• A. Container image format and distribution only
• B. Runtime environment only
• C. Distribution and runtime environment
• D. Container image format, runtime environment, and distribution

Answer: (D)

The standardization effort in OCI covers three interconnected areas: the container image format, the runtime interface, and the distribution interface. The image format specification defines how images are laid out, how layers are described, and how manifests are structured so tools can build, store, and pull images consistently. The runtime specification defines how a container is actually executed—what configuration the runtime reads, how isolation is achieved, and how the process inside the container is started and managed, so different runtimes can run the same image in a predictable way. The distribution specification defines how images are published, transported, and retrieved from registries, enabling interoperability across different registries and clients.

Because OCI standardizes all three areas, the correct choice is the one that includes container image format, runtime environment, and distribution. The other options omit one or more of these areas, which is why they’re incomplete.