4. Consider the following decision made by Old Century Power Company. In electricity production, once electricity has been generated at a power plant, distribution networks are needed to bring electricity to the customer. Suppose Old Century Power Company has decided to build its own electricity generating plants and its own electricity distribution network. In making this decision, Old Century Power Company has calculated that economies of scale or economies of scope exist when electricity generation and electricity distribution are integrated under unified ownership? A. economies of scope B. economies of scale