Consider the following work breakdown structure:

$\backslash$table$[[,,,$Time Estimates $($days$),],[$Activity$,$Precedes,Optimistic,Most Likely,Pessimistic$],[$Start$,$A$,$ B$,$ C$,-,-,62],[$A$,$D$,38,50,108],[$B$,$E$,90,99,115],[$C$,$End,$85,100,31],[$D$,$F$,19,25,115],[$E$,$End,$91,100,68]]$

What is the estimated expected $($mean$)$ time for project completion?A$.199$days b$\mathrm{.}100$days c$\mathrm{.}140$days d$\mathrm{.}440$days e$\mathrm{.}200$days