My Wi-Fi router is ethernet cable connected to my cable modem and the router also has ethernet ports for a wired network to be connected to the Wi-Fi LAN. The only IP that the ISP detects belongs to the router. It doesn't know, or care how many, or if anything beyond the router is cabled, or Wi-Fi.
I'd tell them you are cabled as you actually are when your signal leaves the house and anyone willing to hack your Wi-Fi would have to be within its less than 150' range. (most are only 75' range under ideal conditions, but a few powerful units can reach 150'.) You could also run an ethernet cable to the router, but the ISP would still be seeing the same IP address and I haven't seen any software that could differentiate what was on the other side of the router.
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