$6.$ The data for a Time$-$Cost CPM Scheduling analysis are given below. The time is in days and the costs include both direct and indirect costs.

Immediate Normal Crash Normal Crash

Activity Predecessor Time Time Cost Cost

A None $32$ $$200$ $$400$

B A $43$ $$300$ $$600$

C A $11$ $$300$ $$300$

D B and C $32$ $$500$ $$550$

E D $21$ $$500$ $$900$

If you crash this project to reduce the total time by four days, what is the total time of the project and total cost?

A$.$ Total time is $10$ days, total cost is $$2500$

B$.$ Total time is $9$ days, total cost is $$2300$

C$.$ Total time is $8$ days, total cost is $$2750$

D$.$ Total time is $8$ days, total cost is $$1850$

E$.$ Total time is $9$ days, total cost is $$2350$

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