a. Find the general flow pattern of the network shown in the figure. b. Assuming that the flow must be in the directions indicated, find the minimum flows in the branches denoted by x2, x3, x4, and x5. a. Choose the correct answer below and fill in the answer boxes to complete your choice. A. x1 is free, x2 =, x3 =, x4 =, x5 =, x6 =. B. x1 =, x2 is free, x3 =, x4 is free, x5 is free, x6 =. C. x1 =, x2 is free, x3 is free, x4 is free, x5 is free, x6 =. D. x1 =, x2 =, x3 is free, x4 =, x5 =, x6 is free.