Suppose that the four owners of a company, A, B, C, and D, own, respectively, 500 shares, 375 shares, 225 shares, and 400 shares. There are a total of 1500 votes; half of this is 750, so the quota is 751. The weighted voting system for this company is {751: 500, 375, 225, 400}. a. Determine the winning coalitions. b. For each winning coalition, determine the critical voters. c. What kind of voting system is this? d. What is the total number of possible coalitions