There is a very simply project consisting of three sequential activities (and so all three activities are critical). Here is info about the activities (you cannot make an activity faster than its crash time): Immediate Predecessor(s) Activity A B Normal Time Crash Time Normal (days) (days) Cost 7 6 $6,000 4 2 $1,200 11 9 $4,600 Total Cost with Crash Cost Crashing Per Period $6,200 $200 $3,000 $900 $6,600 $1000 A B a) What activity should be crashed first by one day to reduce the project duration by one day? b) Continuing from part a, what activity should be crashed next by one day to reduce the project duration by one additional day (and thus shorten the project by two days total)? c) How much does it cost to shorten the project by two days (as in parts a and b)? $ (enter your answer as a whole number)