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$,7,-],[$C$,8,$A$],[$D$,11,$B$,$ C$],[$E$,9,$B$],[$F$,5,$D$],[$G$,4,$E$],[$H$,9,$F$,$ G$]]$

a$.$ Choose the correct network diagram below.

$$ B$.$

$$

c$.$ D$.$