TB CA Qu$.05-54$ A simple project Ilsting of flve activitles, thelr predecessors...

A simple project listing of five activities, their predecessors, and their respective time estimates are presented below:

$\backslash$table$[[$Activity$,$Immediate Predecessor,Time in Days$],[$A$,$None,$2],[$B$,$A$,2],[$C$,$A$,1],[$D$,$B and C$,3],[$E$,$D$,1]]$

Using the CPM$,$ which activities have slack in this project? $($Select all that apply.$)$