$\backslash$table$[[$Activity$,$Normal$\_$time Crash$\_$time,Normal$\_$cost Crash$\_$cost Slack$],[$A$,33,21,4900,6300,1,,,],[$B$,21,21,4700,4700,0,,,],[$C$,15,12,4000,6700,0,,,],[$D$,25,25,4300,4300,1,,,],[$E$,14,14,5600,5600,0,,,],[$F$,33,24,5400,6900,1,,,]]$

The table shows normal time $($in days$),$ crash time $($in days$),$ normal cost $($in dollars$),$ crash cost $($in dollars$)$ and slack time $($in days$)$ of activities in a small construction project. According to this table which activity must be crashed first? Assume there is only one critical path. $($Only type the name of the activity, Example: A$.$ @orsdemir. Copyrighted content. Cannot be posted.$)$