From the following network data, determine the critical path, starting and finishing times, and TFs and FFs.Activity Description Duration Immediate Predecessors ST Start milestone - Activity Description duration Inmdiate predesesor ST Start milestone - - A excavate st. 1 4 ST B Order & steel del. work 7 ST C Formwork st. 1 4 A D Excavate st2 5 A E concrte st 1 8 C F Formworkstage2 2 C, D G Back?ll stage 1 3 E H Concrete stage 2 8 E, I Erect steelwork 10 B, J Back?ll stage 2 5 G, H END End milestone - I,