Which of the following is not one of the typical sources of competitive pressures, according to Michael Porters five factor model? A. The threat of new entrants into the market
B. The attempts of companies in other industries to win customers over to their own substitute products
C. The power and influence of industry's key success factors
D. The market maneuvering and jockeying for buyer patronage that goes on among rival firms
E. The bargaining power of suppliers and seller-supplier collaboration