$12-6$ Draw the network and identify the critical path. Also calculate the earliest$-$latest starting and finishing times for each activity:

$\backslash$table$[[$Activity$,$Preceding Activity,Time $($Weeks$)],[$A$,-,4],[$B$,-,6],[$C$,$A$,$ B$,7],[$D$,$B$,8],[$E$,$B$,5],[$F$,$C$,5],[$G$,$D$,7],[$H$,$D$,$ E$,8],[$I$,$F$,$ G$,$ H$,4]]$