Please answer A, B, C. Thank you.

Three activities are candidates for crashing on a project network for a large computer installation (all are, of course, critical). Activity details are in the following table: Immediate Predecessor(s) Activity A Normal Time Crash Time (days) (days) 7 6 4 2 11 9 Normal Cost $4,500 $1,500 $4,200 Total Cost with Crashing $4,900 $3,200 $6,400 A B B a) Activity that should be crashed first to reduce the project duration by 1 day is A. b) Activity that should be crashed next to reduce the project duration by one additional day is B c) Total cost of crashing the project by 2 days = $| (Enter your response as an integer.)