A simple project listing of five activities and their respective time estimates are presented here:

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

Using CPM$,$ which activities make up the critical path?