QUESTION $2$

A simple CPM network has three activities, A B$,$ and C$.$ A is an immediate predecessor of B and of C$.$ B is an immediate predecessor of C$.$ The activity durations are $A=4,B=3,C=5,$

A$.$ The critical path is A$-$B$-$C$,$ duration $12.$

B$.$ The critical path is A$-$B$-$C$,$ duration $9.$

C$.$ The critical path is A$-$C$,$ duration $10\mathrm{.}5.$

D$.$ The network has no critical path.

E$.$ The critical path cannot be determined without knowing PERT expected activity times.

QUESTION $3$

simple CPM network has three activities, D$,$ E$,$ and F$.$ D is an immediate predecessor of E and of F$.$ E is an immediate predecessor of F$.$ The activity durations e $D=4,E=3,F=6,$

A$.$ The critical path is D$-$E$-$F$,$ duration $12.$

B$.$ The critical path is D$-$F$,$ duration $10.$

C$.$ Slack at $D$ is $0$ periods.

D$.$ Slack at $E$ is $3$ periods.

E$.$ Both A and $C$ are true.