Assume that the activity time estimates $($in days$)$ for the swimming pool construction project are as follows:

$\backslash$table$[[$Activity$,$Optimistic,Most Probable,Pessimistic$],[$A$,3,5,6],[$B$,2,4,6],[$C$,5,6,7],[$D$,7,9,10],[$E$,2,4,6],[$F$,1,2,3],[$G$,5,8,10],[$H$,6,8,10],[$I$,3,4,5]]$

a$.$ What are the critical activities? If necessary, round your answers to two decimal places. If your answer is zero, enter $"0".$

$\backslash$table$[[$Activity$,$Expected Time,Variance$],[$A$,,],[$B$,,],[$C$,,],[$D$,,],[$E$,,],[$F$,,],[$G$,,],[$H$,,],[$I$,,]]$