Question $4(18$ marks$)$Read the following scenario and answer the question that follows:Harriet is a collector of old vintage cars. She recently bought herself a second$-$hand vintage car from Vintage Vehicles $($Pty$)$ Ltd$,$ which requires repair work. She paid the purchase price, and the car was delivered to her home with the necessary documentation, like the registration papers and spare keys.She wants to replace the car's interior with leather seats and takes it to a local upholster and fellow vintage car enthusiast, Sergio.Sergio used his locally sourced leather material and replaced the interior as required. At this point, Harriet had not paid him for any of his expenses or services.The agreement was that she would do so on completing the upholstery project.On the day of collection, Sergio does not want to give Harriet her car back. He claims that because he replaced the entire interior of the car and paid for the leather material to do so$,$ he has become the car's owner. Harriet is furious and wants to institute legal action for the return of her car.Required:For this question, assume that the newly upholstered car is a composite thing. With reference to case law, discuss and determine whether Harriet or Sergio describe the components of a composite thing and apply it to the scenario above to determine who the owner is$.$