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.

Question

anonymous · Answer

Which relation is a function?

 (parts number, serial number)

 (model number, parts number)

 (serial number, model number)

 (serial number, part number)