Given the project data below, which activities are critical and what is the length of the critical path? If activity E is reduced by 2 days, what additional activities become critical?
Activity Duration Precedents
A 4 None
B 5 None
C 2 B
D 3 A, B
E 6 C, D
F 3 C, D
G 5 F
H 3 E, F
I 4 G, H