Which of the Following Statements About Supply Chains Is True

Which of the following statements about supply chains is true?

A) All the firms in the chain of supply should work together to meet the needs of the customer at the end of the chain.
B) Logistics functions are not shifted or shared among the firms in the chain of supply.
C) Firms never outsource the whole job of planning and implementing their logistics systems.
D) Supply chains always include at least three channels of distribution.
E) Supply chains include the logistics activities involved in production and distribution,but not those involved in procuring materials.