The following table includes the information about a monthly time series.

Month Time Series

January $21$

February $17$

March $19$

April $24$

When the exponential smoothing method with $\backslash$alpha $=0\mathrm{.}1$ and $\backslash$alpha $=0\mathrm{.}5$ is applied, what is the speed of decline for which the mean absolute deviation is better? What is this mean?

Multiple Choice

$\backslash$alpha $=0\mathrm{.}1$ and MAD $=3\mathrm{.}05$

$\backslash$alpha $=0\mathrm{.}1$ and MAD $=3\mathrm{.}00$

$\backslash$alpha $=0\mathrm{.}5$ and MAD $=3\mathrm{.}00$

$\backslash$alpha $=0\mathrm{.}5$ and MAD $=3\mathrm{.}05$