Two activities on different critical paths that share no common nodes are candidates for crashing on a network. Activity details are in the table below. Activity Normal Time Crash Time Normal Cost Crash Cost 4 days 3 days $6,000 $8.000 00 6 days 4 days $6,000 $4,000 a. To cut one day from the project's duration, activity (ies) should be crashed (enter a single capital letter or a sequence of capital letters in alphabetical order, separated by commas and no spaces). b. This would cost (enter a rounded whole dollar amount with dollar sign; use commas if necessary)