2. A small software development project has 9 major activities. The times are estimated and provided in the network below. [15 points] D 3 A G + c 5 8 6F 17 I 3 7 7 B 3 E 2 5 (a) Using the method ofES, EF, LS, and LF, determine the project completion time? (b) Find the critical path(s). (c) State the non-critical activities. (d) Explain what it means if an activity has a slack of zero (give an example) (e) Explain what it means if an activity has a slack of non-zero (give an example) Formulas LF-EF or LS-ES 2 EF t Estt C 3 LS LF-t a tumtb (4 4 t = 5 vat EN 6 6 @ Output Output Input Labort Capital & Energy