Q$4.[$Textbook Problem $8-3]$

Construct a Gantt chart and project network for the following set of activities, compute the length of each path in the network, and indicate the critical path:

$\backslash$table$[[$Activity$,$Activity Predecessor,Time $($months$)],[1,-,4],[2,-,7],[3,1,8],[4,1,3],[5,2,9],[6,3,5],[7,3,2],[8,4,5,6,6],[9,2,5]]$