b$.$ What is the critical path?

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A$-$C$-$F$-$G$-$I

A$-$B$-$E$-$I

A$-$D$-$H$-$I

A$-$D$-$F$-$G$-$I

c$.$ Suppose you want to shorten the completion time as much as possible, and you have the option of shortening any or all of B$,$ C$,$ D$,$ and $G$ each one week. Which would you shorten?

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B

C

D

$3$

F