Which of the Following Bullets Is Not True About Supply

Which of the following bullets is not true about supply management systems?

A) Supply management systems require software optimization models to run effectively
B) Virtually all firms have supply management systems
C) A cross-functional approach to supply management systems enables the lowest total cost
D) Carefully selected suppliers should also join in-house cross-functional teams in developing supply management systems
E) Supply management systems that include reverse auctions, exchanges, and real-time electronic transmissions only increase the importance of supply management