The Vermont Teddy Bear Co

The Vermont Teddy Bear Co. sells handmade teddy bears designed to be given as gifts for almost every occasion imaginable. The Love Bandit Bear is designed for people to give on Valentine's Day. The unique identification number that the Vermont Teddy Bear Co. uses to distinguish this teddy bear from the others in order to track it in the warehouse is called

A) an inventory ID code.
B) a QR code.
C) a NAICS stock code.
D) an order quantity code.
E) a stock keeping unit.