Consider the following ORDER-PROCESSING database schema: Customer (CustNo, Cname, City) Item (ItemNo, Iname, Unit_price) Order (OrderNo, Odate, CustNo, order_amt) FK: Custno references Customer (CustNo) Order_Item (OrderNo, ItemNo, Qty) FK: Orderno references Order (Orderno) FK: Itemno reference Item (ItemNo) Shipment (OrderNo, WarehouseNo, Ship_date) FK: OrderNo references Order (OrderNo) FK: WarehouseNo references Warehouse (WharehouseNo) Warehouse (WarehouseNo, WarehouseName, City)

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A: The equivalence is also called equivalence of propositions.

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