$\backslash$table$[[$Activity$,$Expected Time $($weeks$),$Immediate Predecessor$($s$)],[$A$,5,--],[$B$,3,-],[$C$,2,$A$],[$D$,5,$B$],[$E$,4,$C$,$ D$],[$F$,7,$D$]]$

a$.$ Choose the correct network diagram for this project.

A$.$

c$.$

$$ D$.$

$$

$$

Q $$

b$.$ Identify the critical path and estimate the project's duration.

The critical path is path $$ and the project duration is weeks. $($Enter your response as an integer.$)$