Activity Z has estimates a = 5, b = 12, m = 7, activity X has estimates a = 5, b = 11, m = 6; and activity Y has estimates a = 3, b = 11, m = 8. Which of the following statements is BEST? Select one: O A. Activity Y has a smaller variance than Activity Z. O B. Activity X has a higher standard deviation than Activity Z. O C. Activity Z is shorter than Activity Y. O D. Activity X is longer than Activity Y. A gentleman farmer maniacally works on academic projects to raise funds for his true passion, farming. He has identified seven tasks and developed three time estimates (all in days) of the next big project on the farm, replacing the fence at the comedy pasture. Tasks, precedence requirements, and time estimates are shown in the table. What is the late finish for the Plant Posts activity? Optimistic Most Likely Pessimistic time time time 4 15 6 Predecessor 7 18 9 Activity Corner Posts String Line Dig Holes Plant Posts Weld Top Bar 10 12 14 (11 8 1 17 14 Corner Posts String Line String Line Dig Holes, Plant Posts Weld Top Bar 9 11 13 Paint Tack Wire 9 12 16 Select one O A 22 days OB. 8 days OC 20.83 days D. 13.3 days