Does reproducible in this context mean: The paper did not document their steps sufficiently, so the authors were unable to reproduce the experiment. -- or --

Does reproducible in this context mean: The paper did not document their steps sufficiently, so the authors were unable to reproduce the experiment. -- or -- The paper relied on circumstantial evidence that was not well-understood enough to be reproduced. -- or -- The authors were able to perform the experiment as documented in the paper, but were unable to reproduce the results. or something else?