Three refineries send a gasoline product to two distribution terminals.
a) Create a matrix or table representation of this scenario, indicating which refineries supply gasoline to each distribution terminal.
b) If the refineries are labeled as R1, R2, R3, and the distribution terminals as D1 and D2, provide an example distribution matrix showing the gasoline supply from each refinery to each terminal.
c) Discuss how such a distribution arrangement might be managed efficiently, considering factors like transportation logistics and supply chain optimization.