Identify whether each of the following transactions involves spot exchange, contract, or vertical integration. a. Barnacle. Incorporated, has a legal obligation to purchase 2 tons of structural steel per week to manufacture convevor frames. 0 Vertical integration 0 Spot exchange 0 Contract 12-. Exxon-Mobil uses the oil extracted from its wells to produce raw polypropylene, a type of plastic. 0 Spot exchange 0 Vertical integration 0 Contract c. Boat Lifts Fl Us purchases generic AC motors from a local distributor. 0 Contract 0 Spot exchange 0 Vertical integration d. Kaspar Constructiona home-building contractorpurchases 50 pounds of nails from the local Home Depot. 0 Contract 0 Vertical integration 0 Spot exchange