Claudio, everyone,
I have just found another impossible Correct Answer marking, another thread where the question has been answered. Period. Pure and simple. No Correct Answer. Nothing Assumed. No superfluousnesses of any kind.
This was just like the one I linked to in post #15, and there was a discussion about it (posts 16 - 18) ending with Madison saying:
I reported this one. I'll let you all know what the jive folks say!
However, they just killed it, and we never heard.
So now I am keeping the new one safe.