O ordering costs O shortage costs Question 7 The production quantity model is O an inventory system in which an order is received instantaneously as inventory is simultaneously being depleted O an inventory system in which an order is placed after the passage of a fixed time period O an inventory system in which an order is received all at once following the lead time O an inventory system in which an order is received gradually as inventory is simultaneously being depleted Question 8 1 pts 1 pts