Serena wanted to buy a car as her new job required her to drive often. She walked into Toyota's new car lot, pointed to a specific car, and said, "I'll take that one." Clement, a Toyota's agent who managed the car lot, explained that there was a certain amount of pre - delivery preparation that had to take place before the car could be delivered, and that it would be ready for the purchaser two days later. It was agreed that the purchase price would be paid at that time.

Explain in details who bears the risk in the meantime with specific attention to the applicable legal principles.