Differences across firms in activities produce disparities in cost and willingness to pay and hence dictate competitive advantage. Which of the following is not correct about the activity analysis? A. The value chain divides all activities into primary and support activities. B. Managers use activities to analyze relative costs and relative willingness to pay. C. To simplify the analysis, managers should assume that the firm operates in a single-dimensional space of decisions. D. A firm usually can't claim any value unless it adds some value. E. A decomposition of the firm into parts should be followed by a vision of an integrated whole.