How is $3$D printing going to change supply chains for customized products?$$

Question $26$ options:

a$)$

Will make postponement more feasible and cheaper overall

b$)$

Will make the lead time to customers longer as companies start making components in house

c$)$

Will make the products more expensive as they are made with new, high$-$tech manufacturing equipment

d$)$

Will cut out suppliers, making few options for customers to choose from$$