A$-$An earth work project only $(3$ machines of type $1$ & $2$ machine of type $2)$ will be available for the work find project time, Construct the project network and draw histogram Resources for two type of machine

$\backslash$table$[[$Act$.,$Time$/$week$,$Resource type$1,$Resource type$2],[1-2,4,1,2],[1-3,5,2,-],[1-4,4,1,2],[2-5,2,2,2],[3-7,1,1,-],[4-6,5,1,2],[4-7,4,1,-],[5-9,4,1,-],[6-9,3,1,1],[7-8,3,2,1],[8-9,1,3,-]]$

B$-$ What are the reasons for resource scheduling?