FlexSteal, marketed as a miracle brush$-$on sealant and baldness cure, is manufactured at three plants which supply the demand at the four regional centres in the United States. The cost to ship a truckload from each of the plants to the regional centres is shown in the table below. Note that the capacity and the total demand are both measured in truckloads. $1.$ What is the lowest cost solution for the existing set of plants and regional centres? A$)\backslash (\backslash$$ $106,850\backslash )$ B$)\backslash (\backslash$$ $107,450\backslash )$ C$)\backslash (\backslash$$ $108,500\backslash )$ D$)\backslash (\backslash$$ $109,750\backslash )$