Problem 15-6 (Algo) Consider the following information about a small project: Task A B D E F Duration Estimates 3 days 2 days 2 days 1 day 4 days 13 days Immediate Predecessors None A B A Esc picture Click here for the Excel Data File b-1. Identify the critical path. O A-D-E-F A-B-C-F O A-B-E-F b-2. Identify the earliest start and finish, and slack for each task. (Leave no cells blank - be certain to enter "O" wherever required.) Task Immediate Predecessors None Earliest Start (ES) Earliest Completion (EC) A B A B D E BD C, E F b-2. Identify the earliest start and finish, and slack for each task. (Leave no cells blank - be certain to enter "O" wherever required.) Task Immediate Predecessors None Earliest Start (ES) Earliest Completion (EC) A B B D A E BD CE F Task Latest Completion Latest Start (LS) Slack F Immediate Successors None F E D E B F CE BD A c. Which of these activities should the project manager track most closely? O A-B-E-F O A-D-E-F O A-B-C-F