Which of the following are NOT assumptions of the newsvendor problem? A. The demand for the product (service) during the period is known with certainty. B. Each application involves a single "perishable" product (service). C. Each application involves a single time period because the product/service cannot be sold later. D. The only decision to be made is how many units/services to order/offer so they can be placed into inventory/scheduled at the beginning of the period