Perceived value and signaling value are often an important part of a successful differentiation strategy because a. of the standardization of buyer needs and preferences. b. buyers seldom will pay for value they don't perceive, no matter how real the value of the differentiating extras may be. c. buyer satisfaction cannot be achieved until a product's value is promoted through clever ads. d. differentiation is all about selling products to sophisticated buyers. e. there are no other ways to differentiate a product.