A newly made car will have a model number, a parts number, and a serial number. A model number is assigned by the manufacturer to identify each type of car. A parts number identifies one part of the smaller parts that make up the car. A serial number is unique to each car produced and identifies it.


Which relation is a function?


(parts number, serial number)

(model number, parts number)

(serial number, model number)

(serial number, part number)