The correct answer is to make notes as changes are discovered, and ensure the team has access to them. This is an appropriate approach to handling change: making the changes highly visible; discussing the changes as a team; putting the
change request into the backlog for future use. The other responses are incorrect because new items go into the product backlog, not the spring backlog; attempting to enforce a formal and rigid change control process, like the guarantee
to respond to requests in less than 24 hours, is not the best approach; an appropriate approach to change management involves more than simply meeting with the client.