Konsider the network diagram and table below. All durations are in days.

$\backslash$table$[[,$Time $($days$),$Cost $($$$),],[$Activity$,$Normal,Crash,Normal,Crash,Crash Cost Per Day$],[$A$,3,2,1000,1200,],[$B$,6,4,1500,1800,],[$C$,7,6,1000,1100,],[$D$,5,4,1200,1600,],[$E$,4,\backslash$table$[[$Not$],[$possible$]],1000,\backslash$table$[[$Not$],[$possible$]],]]$

A$)$ What is the critical path?

B$)$ To shorten the project from $12$ to $11$ days, what activity should be crashed and what is the cost of crashing?