The following is a table of activities associated with a project at Rafay Ishfaq's software firm in Chicago, their durations, what activities each must precede and the crash cost to reduce duration per week:ActivityDuration $($weeks$)$PrecedesCrash Cost$/$WeekA $($start$)1$B$,$ C$$400$B$1$E$$100$C$4$F$$200$E$2$F$$300$F $($end$)2$$$400$ Part $2$Suppose that Rafay is only given $5$ weeks $($instead of $7)$ to complete the project. By how many weeks should each activity be crashed in order to meet the deadline? Assume that you can crash an activity down to $0$ weeks duration.