Given the following task time estimates $($HOURS$),$

TaskTimePredecessorA$40$B$20$C$25$AD$19$A$,$ BE$25$C$,$ DF$24$EG$18$F

a$.$ How long is the project length? $[$ Select $]["122\mathrm{.}00","134\mathrm{.}83","127\mathrm{.}45","132\mathrm{.}00","135\mathrm{.}78"].$

b$.$ What tasks form the critical path? $[$ Select $]["$B$,$ D$,$ E$,$ F$,$ G$","$A$,$ C$,$ E$,$ F$,$ G$","$A$,$ D$,$ E$,$ F$,$ G$","$B$,$ C$,$ D$,$ E$,$ F$,$ G$","$A$,$ B$,$ C$,$ E$,$ F$,$ G$"]$

c$.$ What is the LS$/$LF for activity D$.?[$ Select $]["44$ and $55","46$ and $65","65$ and $90","50\mathrm{.}19$ and $7\mathrm{.}08","34\mathrm{.}56$ and $4\mathrm{.}78"].$

d$.$ How much slack is there in activity C$?[$ Select $]["12$ hours", $"6$ hours", $"29$ hours", $"0","8\mathrm{.}34$ hours"$]$ How much slack in activity D$?[$ Select $]["6$ hours", $"28$ hours", $"26$ hours", $"0,$ it is on the critical path", $"5$ hours"$]$

e$.$ What if activity D$.$ was delayed by $7$ hours, what would be the project length and critical path? $[$ Select $]["132$ hours; A$,$ C$,$ E$,$ F$,$ G$","134$ hours; A$,$ C$,$ E$,$ F$,$ G$","$no change in either the critical path or project length", $"130$ hours; B$,$ C$,$ E$,$ F$,$ F$","133$ hours; A$,$ D$,$ E$,$ F$,$ G$"]$

f$.$ Referring to letter e$.,$ how much slack would be in activity B$.?[$ Select $]["26$ hours", $"0($zero$),$ it is now on the critical path", $"8$ hours", $"20$ hours", $"6$ hours"$]$