Option 2 is what we see but it isn't immediately obvious if it goes directly to a VC. Because we didn't see 2 X 16/4s going into any VCs, we looked for an autoformer that might be hidden in one of the crawl spaces but we can't find it. Unfortunately the attic spaces are very limited so it's difficult to track where the wires go. This one is turning quickly into a paid "Discovery" return visit prior to bidding.

Thanks for the info.