Construction of a building is based on the following CPM network: Construction of a building is based on the following CPM network: Predecessor Successor B$,$ C$,$ D E Normal Time $6823$ Crash Time $221$ Activity A B $$ D E F G A B$,$ A A B C$,$ D E$,$ F$,$ D Normal Cost $ $1008040808060120$ F F G G Crash Cost $ $150140601201401001605562312$ Draw the network and answer the following questions. a$.$ What are the normal project completion time and normal cost? Answer is complete and correct. Normal completion time $27$ daysAnswer is complete and correct. Normal cost $ $560$ b$.$ Identify the critical path. $($You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.$)$ O A$-$D$-$G O A$-$B$-$E$-$G O A$-$D$-$F$-$G A$-$B$-$C$-$F$-$G O A$-$C$-$F$-$Gc$.$ How much additional cost is needed to crash the project by one day? Answer is complete and correct. Additional cost S $10$ to crash one day off the project.This can be accomplished most effectively by crashing any one of which three activities below? $($You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer.$)$ ID $$E F $$Gd$.$ What is the minimum time for project completion? Answer is complete but not entirely correct. Completion time $8$ X days