A project for improving a billing process has the following precedence relationships and activity times:

$\backslash$table$[[$Activity$,$Activity Time $($weeks$),$Immediate Predecessor$($s$)],[$A$,4,-],[$B$,12,-],[$C$,5,$A$],[$D$,12,$B$,$ C$],[$E$,10,$B$],[$F$,5,$D$],[$G$,8,$E$],[$H$,9,$F$,$ G$]]$

a$.$ Choose the correct network diagram below.

$$ A$.$ B$.$

$$

c$.$

D$.$