Registry Question Explained
This worked Docker Fundamentals practice question tests Images. Try the answer first, then review why A is the best choice.
Short answer
The correct answer is A. A container image registry.
Docker Hub is a registry for pushing and pulling container images. Private registries such as ECR, GHCR, and GCR serve the same broad role. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, A. A container image registry is the only option that satisfies the scenario without adding unrelated behavior.
The Question
What is Docker Hub an example of?
Why A is correct
Docker Hub is a registry for pushing and pulling container images. Private registries such as ECR, GHCR, and GCR serve the same broad role. The key is to match the exact action in the prompt to the tool, command, or concept that performs that action directly. Here, A. A container image registry is the only option that satisfies the scenario without adding unrelated behavior.
Why the other options are wrong
Option B does not match the requirement in the prompt. The correct answer is A because Docker Hub is a registry for pushing and pulling container images. Private registries such as ECR, GHCR, and GCR serve the same broad role.
Option C does not match the requirement in the prompt. The correct answer is A because Docker Hub is a registry for pushing and pulling container images. Private registries such as ECR, GHCR, and GCR serve the same broad role.
Option D does not match the requirement in the prompt. The correct answer is A because Docker Hub is a registry for pushing and pulling container images. Private registries such as ECR, GHCR, and GCR serve the same broad role.
Key idea: Images
Images questions test whether you can connect a common workflow problem to the right practical command, service, or concept. Instead of memorizing isolated definitions, look for the job being done in the prompt: staging a file, querying rows, running code, persisting container data, checking a service, or choosing the right cloud building block. The best answer usually names the simplest tool that performs that job directly. For Docker Fundamentals, the safest study pattern is to read the scenario, underline the action verb, and eliminate answers that solve a different problem. If an option sounds related but changes the scope, adds risk, or describes a different layer of the stack, it is probably a distractor. After choosing an answer, explain why the other three fail; that habit builds the practical judgment these quizzes are meant to measure.
Ready to test the full skill?
Take the free Docker Fundamentals quiz and find the exact basics to review next. No signup required.
Practice related questions
Same skill area or adjacent concept. Use these after reviewing the explanation.