AA group of containers that share selected namespaces, like a Kubernetes pod
BA single container image bundled together with all of its build layers
CA remote registry namespace that groups related images under one account
DA snapshot of a running container saved for later restart or rollback
Why this is the answer
A Podman pod groups containers that share namespaces (network by default), mirroring a Kubernetes pod. It is not an image plus its layers, a registry namespace, or a saved container snapshot.