Which One of the Following Statements Is True

Which one of the following statements is true?

A) Postponement is the process of delaying orders from suppliers because it is very difficult to order from geographically dispersed businesses.
B) General Motors supply chain is a good example of a push system.
C) Dell Computers supply chain is a good example of push system.
D) Flexibility and responsive service are top priorities compared to low cost in an efficient supply chain.