14. Which of the following statements is either true or false?

(a) A "location measure", in models such as Brown and Gibson's model, is valid only for the annual turn- over.

(b) The main purpose of Taguchi methods is to test the robustness of a design.

(c) The main objective of IPOM is to increase the development time.

(d) Vertical integration is the degree to which a firm owns its upstream suppliers and its downstream buyers.