y courses ECN1101-90908202109 Assessments Assignment 7 - Chapter 7 What is the long-run average cost curve? O a. A graphical representation of the average costs of production in the long run. O b. A measurement of the percentage of an industry's total sales which is controlled by the four largest firms. O c. A portion of the short-run average total cost curve. O d. A graphical representation of the total variable cost. O e. A graphical representation of those costs that do not vary with the level of output. Ne