Which of the followings are correct？

A.Many businesses use multiple suppliers so they are not overly reliant on any one other business.

B.Business purchasing decisions often involve development of a formal product requirement specification.

C.New task purchases are likely to involve extensive evaluation of options.

D.Buyers have the final authority to make business purchasing decisions.

正确答案：Many businesses use multiple suppliers so they are not overly reliant on any one other business.Business purchasing decisions often involve development of a formal product requirement specification.New task purchases are likely to involve extensive evaluation of options.