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Should you not therefore answer it as such?

Assuming you're talking to me, I would but there's a 50/50 chance I'd get it wrong as I don't know the answer

Well actually I did mean, "Are you in either zone 1 or zone 2 or both?"

I suppose for the purpose of non-station locations, you could draw a straight line between each station that's outermost in the zone, and that would produce a shape outside which you could consider it not to be the zone.