P 4-1. Prepare a narrative to describe the system depicted in the physical DFD in Figure 4.15. Figure 4.15 Physical DFD for Problem 4-1 Customer Email acknowledgement Customer telephone order Annotated picking ticket (copy 2)-paper 1.0 Sales Order office data 2.0 Picking ticket (2-part) Order acceptance Computer 3.0 Warehouse Annotated picking ticket (copy 1) 4.0 Shipping Packing slip (copy 1) Carrier Packing slip (copy 2), Annotated picking ticket (copy 1)-paper Inventory master data-disk Customer master data-disk Accounts receivable master data-disk +