Given the following project network:

a$-1.$ Identify the critical path.

$A-C-E-F$

$A-C-D-F$

$A-B-D-F$

a$-2.$ Identify the earliest start and finish for each task. $($Leave no cells blank $-$ be certain to enter $"$O$"$ wherever required.$)$

$\backslash$table$[[$Task$,\backslash$table$[[$Immediate$],[$Predecessors$]],$Earliest Start,Earliest Completion$],[$A$,$None,$0,$weeks,$1,$weeks$],[$B$,$A$,1,$weeks,$7,$weeks$],[$C$,$A$,1,$weeks,$2,$weeks$],[$D$,$B$,$ C$,7,$weeks,$16,$weeks$],[$E$,$C$,2,$weeks,$7,$weeks$],[F,D,E,15,$weeks:,$15,$weeks$]]$

b$.$ Calculate slack for every project activity. $($Leave no cells blank $-$ be certain to enter $"0"$ wherever required.$)$

$\backslash$table$[[$Task$,\backslash$table$[[$Immediate$],[$Successors$]],\backslash$table$[[$Latest$],[$Completion$]],$Latest Start$],[F,$None,,$],[E,F,,],[D,F,,],[C,D,E,,],[B,D,,],[A,B,C,,]]$