en the Following EVENTS (NODES) and TIMES (days) ctivity Start Finish A B C D 1 2 1 2 3 0 days O2 days 3 days 4 days 12 days 3 4 A OPTIMISTIC 41 54 58 32 MOST LIKELY 50 60 70 41 at is the estimated standard deviation in the time for activity D? PESSIMIST 59 66 82 44