I) An effective push-pull supply chain design strategy feature pull stages that are operated make-to-order II) An effective supply chain design strategy is indecated for a product with high economies of scale and a low degree of demand uncertainty III) An effective supply chain design strategy is indecated for a product with short supply chain lead times and a low degree of demand uncertainty Which are true? A) I and II B) II and III C) I and III D) I, II, III E) None is true.