Consider the following project schedule:
Activity Immediate
Predecessor Time ES EF LS LF
A -- 4 0 4 6 10
B -- 5 0 5 0 5
C A 3 4 7 10 13
D B 8 5 13 5 13
E B 2 5 7 16 18
F C, D 3 13 16 15 18
G C, D 7 13 20 13 20
H E, F 2 16 18 18 20
(a) Which activities are critical?
(b) Which activity has the most slack?
(a) B, D, G
(b) E
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Fill in the blank(s) with the appropriate word(s).