Ah-ha, much obliged, folks. Interesting to see that a seemingly simple can trigger such a discussion/digression.
In the absence of any TAF mentioned in the question, I'd assume that only the 10 min before last light rule applies here and will call answer #4, ie. 270523 the correct one
The more confusing part of this thread is that one of you is LeadSled and the other is Lead Balloon.