$3\mathrm{.}7$ Task time estimates for a production line setup project at Robert Klassen's Ontario factory are as follows:ImmediatePredecessorsActivityABCGTime $($in hours$)6\mathrm{.}07\mathrm{.}25\mathrm{.}06\mathrm{.}04\mathrm{.}57\mathrm{.}74\mathrm{.}0$AB$,$ C B$,$ CDB$,$ Fgsa$)$ Draw the project network using AON.b$)$ Identify the critical path.c$)$ What is the expected project length?d$)$ Draw a Gantt chart for the project.