Together with your team, you applied three$-$point estimation on a critical path which consists of three activities. The duration uncertainties $($standard deviation$)$ for the three tasks are calculated and are: $8,6,$ and $4.$ Applying the PERT formula for paths, what is the duration uncertainty of the entire path?

$1$ point

$4\mathrm{.}24$

$10\mathrm{.}77$

$18$

It is not possible to answer from the information given