Which open standard provides a specification for container images and runtimes, ensuring consistency and compatibility in the container ecosystem?

• A. Open Container Initiative (OCI)
• B. Docker Image Specification
• C. Containerd Runtime Standard
• D. Kubernetes Image Format

Answer: (B)

Open standards for container images and runtimes enable interoperability across tools and runtimes. The Open Container Initiative provides an open specification for container images and a separate runtime specification. The OCI Image Format defines how images are packaged (layers, config, manifest), while the OCI Runtime Specification describes how a runtime should create, start, and manage a container. Because both specs are adopted by multiple tools, an image built with one tool can run on any OCI-compliant runtime, ensuring consistency and compatibility throughout the container ecosystem. The Docker Image Specification is historically Docker-centric and not the universal standard for both images and runtimes, while other options refer to implementations or formats that don’t offer the same broad, open interoperability.