$\backslash$table$[[$activity predecessors normal$\_$time crash$\_$time$],[$A$,,2,2,4500,4500],[$B$,$A$,5,2,3500,6500],[$C$,$B$,2,2,2000,2000],[$D$,$C$,2,2,3000,3000],[$E$,$B$,5,2,4500,13500],[$F$,$E$,3,1,5500,13500]]$

The table shows normal time, crash time, normal cost, crash cost of activities in a project. According to this table which activity must be crashed first? $($Only enter the name of the activity. Lower or uppercase both work. Ex: A or a$.$ Copyrighted content. Cannot be posted. Oorsdemir$)$