Table $7\mathrm{.}4$

$\backslash$table$[[$Activity$,$Predecessor,Time$($weeks$)],[$A$,--,6],[$B$,--,6],[$C$,$A$,4],[$D$,$B$,9],[$E$,$C$,$D$,11],[$F$,$E$,3]]$

Using Table $7\mathrm{.}4,$ what is the largest amount of slack that any activity in the project has? two weeks

three weeks

zero weeks

four weeks