c$.$ Use the Winters method with smoothing constants $===0\mathrm{.}2$ to develop a forecast for these data. How does it fit? What is the resulting MSD$?$ Develop a graph for both $f(t)$ and $A(t)$ with Quarter on the $x-$ axis and Demand on the y$-$axis.

$\backslash$table$[[$Year$,$Quarter,$\backslash$table$[[$Demand$],[A(t)$