Consider the following data for a project to install a new sever at the Northland Pines High School:

$\backslash$table$[[$Activity$,$Activity Time $($days$),$Immediate Predecessor$($s$)],[$A$,1,-],[$B$,4,$A$],[$C$,3,$A$],[$D$,4,$B$],[$E$,1,$B$],[$F$,6,$B$,$ C$],[$G$,2,$D$,$ E$],[$H$,6,$F$],[$I$,3,$F$],[$J$,6,$G$,$ H$,$ I$]]$

a$.$ Choose the correct network diagram below.

A$.$ B$.$

C$.$

D$.$

b$.$ Calculate the critical path for this project.

The critical path is $$ and the project duration is $$ days. $($Enter your response as a whole number.$)$

$A-B-D-G-J$

A$-$C$-$F$-$H$-$J

A$.$B$-$E$-$G$.$J

A$.$C$.$F$-$I$-$J

et more help $-$

A$-$B$.$F$.$H$-$J

A$-$B$.$F$-$A$.$J