consider the following project network and activity times (in days). a project network is given with the starting point on the left and the finish point on the right with activities a through g. the arcs between the activities are listed as follows. start to a and to b. a to c. b to d. c to e and to f. d to e and to f. e to finish. f to g. g to finish. activity a b c d e f g time 2 2 6 4 5 2 2