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$,14,$B$,$ C$],[$E$,11,$B$],[$F$,4,$D$],[$G$,4,$E$],[$H$,9,$F$,$ G$]]$

a$.$ Choose the correct network diagram below.

A$.$ B$.$

$(4)$

c$.$ D$.$

a$.$ Choose the correct network diagram below.

$$ A$.$

$$

$$ B$.-$

c$.$ D$.$

$(\frac{B}{12})(\frac{D}{14}),(\frac{G}{4})$

r

D$.$

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

$\backslash$table$[[$Activity$,$Activity Time $($weeks$),$On critical path?,Slack $($weeks$)],[$A$,4,$grad,$],[$B$,12,$grad,$],[$C$,5,$grad,$],[$D$,14,$grad,$],[$E$,11,$grad,$],[$F$,4,$grad,$],[$G$,4,$grad,$],[$H$,9,$grad,$]]$