c$)$ To choose between using a moving average and using exponential smoothing, the manager at the store has to ensure that the current number of periods $($i$.$e$.$ four$)$ for the moving average and the current $\backslash$alpha value $($i$.$e$.0\mathrm{.}2)$ for exponential smoothing are appropriate. Discuss how the manager can choose the values for the number of periods and the $\backslash$alpha value, and the advantages and disadvantages of this method.