A project has been defined to contain the following list of activities, along with their required times for completion

$\backslash$table$[[$Activity$,$TIME $($DAYS$),$IMmediate Predecessors$],[$A$,1,-],[$B$,4,$A$],[$C$,3,$A$],[$D$,7,$A$],[$E$,6,$B$],[$F$,2,$C$,$ D$],[$G$,7,$E$,$ F$],[$H$,9,$D$],[$I$,4,$G$,$ H$]]$

a$.$ Draw the critical path diagram.

b$.$ Show the early start, early finish, late start, and late finish times.

c$.$ Show the critical path.

d$.$ What would happen if activity $F$ was revised to take four days instead of two?