Identify the following systems as push or pull according to whether they regulate releases on the basis of system status in a manner that establishes a WIP cap. a. A server at Amazon. b. The drive-up window at a bank. c. The gas tanks at a filling station. d. The operating rooms at a hospital. e. A commercial printer’s supply chain for paper stock if the printer orders stock needed for customer orders as the orders arrive. f. A commercial printer’s supply chain for paper stock if the printer uses an order-up-to policy in which it reviews the inventory of paper stock each week and orders enough to bring the total up to a prespecified level