$2.$ Answer Questions $\backslash (2\backslash$mathrm$\{$a$\}-2\backslash$mathrm$\{$c$\}\backslash )$ using the figure shown below: $(21$ points$)$

$2$a$.$ The critical path is and its length is weeks.

$2$b$.$ The total slack time in Activity $"$F$"$ is weeks

$2$c$.$ If the crash cost$/$week for all activities is the same and we can crash all activities by $2$ weeks except Activity H by a week and customer wants us to shorten the project length by $3$ weeks, we should crash Activity by week$($s$)$ first and then crash Activity by week$($s$).$