3 What is a supply chain? (2.1)

A、A supply chain is everything that delivers a product to a buyer, from personnel to machines to technology.
B、A supply chain is the fleet of vehicles that deliver product from factories to retail locations.
C、A supply chain is all the elements of a manufacturing process, from machine design to transportation.
D、A supply chain is the hierarchy of personnel in charge of producing products for a company.
E、A supply chain is the detailed diagram of the sales process.