I'm not on IB, but the regular "old" booking system. In contrast to a booking request (decline or approve within 24 hours) I thought that an inquiry just needed to be answered to in a timely manner in order to be recognized by Airbnb as a valid response, but I now see that after I send off my reply message, the red pre-approve/decline button remains highlighted in red under the inquiry in my inbox, as if I still needed to do something about it, possibly meaning that I can't just answer the inquiry with a return message, but that I also must choose between either preapproving or declining. Is that correct? I'm afraid that if I don't activate the button, my answer will not be sufficient enough to be counted as response in Airbnb's system.