Task time estimates for the modification of an assembly line at Jim Goodale's Carbondale, Illinois, factory are as follows:

$\backslash$table$[[$Activity$,\backslash$table$[[$Time$],[($in hours$)]],\backslash$table$[[$Immediate$],[$Predecessor$($s$)]]],[$A$,6\mathrm{.}0,-],[$B$,7\mathrm{.}2,-],[$C$,6\mathrm{.}0,$A$],[$D$,8\mathrm{.}0,$B$,$ C$],[$E$,5\mathrm{.}1,$B$,$ C$],[$F$,7\mathrm{.}7,$D$],[$G$,5\mathrm{.}0,$E$,$ F$]]$

This exercise contains only part a$.$

a$)$ The correct precedence diagram for the project is shown in