activity predecessors normal$\_$time crash$\_$time normal$\_$cost crash$\_$cost

A $5340008000$

B A $4430003000$

C B $2125006000$

D C $3135009500$

E B $4440004000$

F E $51500015000$

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. $$orsdemir$)$