Given the following data, according to MAD$/$MAE which is the most accurate forecasting technique$---$the naive forecast, the two$-$period moving average forecast, the weighted moving average forecast with weights of $\mathrm{.}5,\mathrm{.}3,$&$\mathrm{.}2,$ respectively, or the exponential smoothing forecast with $a=\mathrm{.}2?$

Month Demand

$19$

$2,20$

$3\mathrm{.}18$

$4,19$

$5,17$

two$-$period moving average forecast

weighted moving average forecast with weights of $\mathrm{.}5,\mathrm{.}3,$&$\mathrm{.}2$

na$$ve forecast

exponentially smoothed forecast with $a=\mathrm{.}2$