$\backslash$table$[[$Activity$,$Preceding,$\backslash$table$[[$Optimistic$],[$Time$]],\backslash$table$[[$Probable$],[$Time$]],\backslash$table$[[$Pessimistic$],[$Time$]],\backslash$table$[[$Expected$],[$Time $($days$)]]],[$A$,-,7,10,19,11],[$B$,$A$,2,2,8,3],[$C$,$A$,8,12,16,12],[$D$,$A$,3,5,10,5\mathrm{.}5],[$E$,$B$,4,6,8,6],[$F$,$B$,6,8,10,8],[$G$,$C$,$ F$,2,3,4,3],[$H$,$D$,2,2,8,3],[$I$,$H$,6,8,16,9],[$J$,$G$,$ I,$4,6,14,7],[$K$,$E$,$ J$,2,5,8,5]]$

Using the provided information above, determine the following:

The activities that cannot be delayed and the expected time for completing the project.