John Farmer ordered a new tractor from Lykins Tractor Sales, which delivered the tractor to Farmer's residence on Friday. On Saturday, Farmer tried to use the tractor, but discovered that it was inoperable. The battery was dead, the water pump was missing, and various other parts were defective or improperly installed. On Monday, Farmer called Lykins to notify it that he wanted to return the tractor. Farmer stated that he would leave the tractor in his front yard, and Lykins agreed that an employee would pick up the tractor within a few days. On Wednesday, the tractor was stolen from Farmer's yard. Lykins asserts that Farmer is liable to pay for the tractor, but Farmer insists that Lykins bears the risk of loss. Who is correct? Explain.