Which of the followings is True? a

Which of the followings is True?

a.     In a buy-back contract, the profits of the channel are equal to the maximum profits of a centralized supply chain that is managed by a single decision maker

b.    The supplier always benefits from a buyback contract, but it is not clear whether the buyer benefits from a buyback contract

c.     In a buy-back contract, we have only one pair (w,b) that coordinates the channel

d.    In a buy-back contract, both supplier and buyer benefit from the contract and increase their profits, but the channel profits may decrease