Which of the following statements about cost efficiencies due to industry/industries concentration is correct? O industry concentration in one urban area will determine agglomeration efficiencies in that area O economies of scale are usually derived from the concentration of several industries in an urban area O industry concentration is a requirement for economies of scale, while the concentration of several industries is required for agglomeration economies O agglomeration efficiencies are usually derived from the growth of one particular industry in an urban area