Yоu аre respоnsible fоr mаnаging an advertising project with the following activities (times are given in weeks). Immediate Normal Time Crash Time Normal Crash Activity Predecessor (Weeks) (Weeks) Cost ($) Cost ($) A none 3 2 $14,000 $16,500 B none 6 6 $5,500 $5,500 C none 2 1 $6,000 $8,000 D A, B 5 3 $7,500 $14,500 E C 2 1 $9,000 $10,500 F A 7 6 $15,000 $18,000 G D, E, F 4 3 $8,400 $10,000 What activity should one crash to reduce the project completion time by two weeks at minimum crash costs?