Altin leaves his Mazda Miata at Nate’s Service Center to obtain new tires and brakes. When the work is done, Altin refuses to pay. Nate’s

a. can retain possession of the car and place a lien on it.

b. can retain possession of the car even if its owner later pays.

c. must return the car but can file a suit in the appropriate court.

d. must return the car but can first “undo” its work.