A project has a critical path with activities A$,$ B$,$ and C$.$ Activity A has a duration of $6$ days, Activity B has a duration of $10$ days, and Activity C has a duration of $8$ days. The crash cost for Activity A is $$1500$ per day, for Activity B is $$2000$ per day, and for Activity C is $$1800$ per day. If you need to crash the project by $3$ days, what is the most cost$-$effective way to do it$?$