Task time estimates for the modification of an assembly line at Jim Goodale's Carbondale. Illinois, factory are as follows:

ACTIVITY TIME $($IN HOURS$)$ IMMEDIATE PREDECESSORS

A $6\mathrm{.}0----$

B $7\mathrm{.}2----$

C $5\mathrm{.}0$ A

D $6\mathrm{.}0$ B$,$ C

E $4\mathrm{.}5$ B$,$ C

F $7\mathrm{.}7$ D

G $4\mathrm{.}0$ E$,$ F

a$.$ Identify the critical path

b$.$ What is the expected project completion time?

a$.$ Critical path $=$ A$-$C$-$D$-$F$-$G

b$.$ Completion time $=28\mathrm{.}7$

a$.$ Critical path $=$ A$-$C$-$D$-$F$-$G

b$.$ Completion time $=28\mathrm{.}0$

a$.$ Critical path $=$ A$-$C$-$D$-$F$-$E

b$.$ Completion time $=28\mathrm{.}7$

a$.$ Critical path $=$ A$-$C$-$D$-$F$-$G

b$.$ Completion time $=26\mathrm{.}7$