How Has the View of Sales Promotions Changed During the Past

How has the view of sales promotions changed during the past decades?

A) Sales promotions are now believed to be an ineffective tool for creating brand image.
B) Sales promotions are now considered an essential part of an organization's branding strategies.
C) Sales promotion tactics are now developed exclusively to provide incentives to purchase.
D) There is no difference between how marketers used to treat sales promotions and how they treat them now.