Which command would move an image tag between image streams?

• A. oc promote
• B. oc tag
• C. oc move
• D. oc image tag

Answer: (B)

Tagging an image into another image stream is how you move a tag from one stream to another. The oc tag command is built for this exact purpose: it takes a source image reference (from a stream tag or a registry) and assigns it to a destination image stream with a specified tag. By re-tagging the same image under a different stream and tag, you effectively move the tag between streams without rebuilding the image.

For example, you can re-tag an image from one stream to another in the same or a different namespace, such as issuing a command that points the destination tag to the same image that the source tag references. This makes oc tag the straightforward tool for moving image tags between image streams.

Other commands serve different workflows. For instance, promotion-related workflows are about moving images through environments as part of a release pipeline, not simply reassigning a tag between streams, and some options don’t represent standard tagging operations. The direct ability to reassign a tag to a different stream is exactly what the tagging command provides.