One day Employee asked the key shack attendant if he could use a car for 30 minutes on his lunch break to go to his mother's house. The key shack attendant told him it was okay as long as he brought it back because, otherwise, she could get in trouble. Employee took the car and left. On his way back to the dealership, Employee rear-ended a car stopped at a stop light, causing injuries to the driver and a passenger. Employee told a police officer at the scene of the accident that he was on a lunch break from his job and that he had permission to drive the car, but his boss was not aware he had the car.
The plaintiffs sued the car dealership on the grounds that it was responsible for the injuries caused by Employee. What will be the argument of the defendant?