33- ABC analysis is based upon the principle that a) more time should be spent on class 1C items because there are more of them b) as with grade distributions in many MBA courses, there should be more medium-level "B" items than either "A" or "C" items c) an item is critical if its usage is high d) there are usually a few critical items, and many items which are less critical e) all items in inventory must be monitored very closely Bo brak