2 When assessing the overall effect on industry profitability of the five forces in Porter's framework, one should follow which of the following approaches? A. focus mostly on the pivotal force, which is the greatest source of competition in the industry. b. Calculate and focus on the average effect of all the forces. c. Use the PESTEL framework to understand how the five forces will affect profitability. d. Ignore the assessment of each of the forces as they have no bearing on profitability