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$,5,-],[$B$,12,-],[$C$,5,$A$],[$D$,14,$B$,$ C$],[$E$,11,$B$],[$F$,5,$D$],[$G$,4,$E$],[$H$,7,$F$,$ G$]]$

a$.$ Choose the correct network diagram below.

A$.$ B$.$

$$ c$.$

D$.$

F

b$.$ Calculate the slack for each activity. Which activities are on the critical path?

$\backslash$table$[[$Activity$,\backslash$table$[[$Activity$],[$Time $($weeks$)]],\backslash$table$[[$On$],[$critical path?$]],\backslash$table$[[$Slack$],[($weeks$)]]],[$A$,5,$No$,2],[$B$,12,$Yes,$0],[$C$,5,$No$,2],[$D$,14,$Yes,$0],[$E$,11,$No$,4],[$F$,5,$Yes,$0],[$G$,4,$No$,4],[$H$,7,$Yes,$0]]$