please answer all 3 questions

An activity has an early start (ES) of day 3, a late start (LS) of day 13, an early finish (EF) of day 9 and a late finish (LF) of day 19. What is the activitys float? O A. 10 3.6 OC.3 OD. 19 You have a project with four activities as follows: Activity 1 can start immediately and has an estimated duration of one. Activity 2 can start after activity is completed and has an estimated duration of four. Activity 3 can start after activity 2 is completed and has an estimated duration of five. Activity 4 can start after activity is completed and must be completed when activity 3 is completed. The estimate for activity 4 is 10. What is the SHORTEST amount of time in which the project can be completed? O A 10 OB. OC.18 0.11 Though you have tried to plan the project to accommodate all major contingencies, you are now asked for the fifth time to decrease the length of time the project will take to complete. The person completing activity Cis no longer talking to you because of the added work she needed to do to accommodate previous decrease in time. She has already told you she cannot shorten her activity any more. The person doing activity has been replaced by a new and less tested resource. The risk of crashing actMy Fis small Based on this and the chart, what is the BEST thing to do? Activity A B C D E F Baseline Time 10 2 14 6 9 8 Cost 34,000 $6,000 $22.000 59.000 $14,000 $18,000 Crash Time 8 2 12 5 7 4 Cost $6,000 56,000 $26,000 $10,000 $19.000 $36.000 O A Determine why there have been so many decreases to the project length B. Invite the person doing activity to lunch to talk about her problems O Evaluate the risk added to the project with the change of resources on activity D OD Make changes to the project to decrease the time the project will tako