Identify whether each of the following transactions involves spot exchange, contract, or vertical integration. a. Barnacle, Inc., has a legal obligation to purchase 2 tons of structural steel per week to manufacture conveyor frames. multiple choice 1 Contract Vertical integration Spot exchange b. Exxon-Mobil uses the oil extracted from its wells to produce raw polypropylene, a type of plastic. multiple choice 2 Spot exchange Contract Vertical integration c. Boat Lifts R Us purchases generic AC motors from a local distributor. multiple choice 3 Vertical integration Contract Spot exchange d. Kaspar Construction—a home-building contractor—purchases 50 pounds of nails from the local Home Depot. multiple choice 4 Spot exchange Vertical integration Contract