The receiving department accepts a shipment, confirms it matches the purchase order, and moves it to an area they call "deep storage." As the time approaches for the shipment to be used, they move it from deep storage to the week's holding pen, and on the day of use, it is transferred to the line near where it will fall into the product stream. When the worker needs it, she goes to where it is stored and brings it to her work station. This illustrates the waste of:. a. un-necessary inventory. b. over-production. c. un-necessary transportation. d. under-utilization of employees.