Using the Data Shown Below in Table 1, Compute the Mean

Using the data shown below in Table 1, compute the mean square error, mean absolute deviation, and mean absolute percentage error for the forecasts shown and then answer Questions
Table 1
$\begin{array}{|l|c|c|}\hline \text { Month } & \text { Forecast Demand } & \text { Actual Demand } \\\hline \text { April } & 170 & 180 \\\hline \text { May } & 225 & 200 \\\hline \text { June } & 210 & 200 \\\hline \text { July } & 260 & 240 \\\hline \text { August } & 200 & 230 \\\hline\end{array}$
-The mean absolute deviation (MAD) is:

A) less than or equal to 20.
B) more than 20 but less than or equal to 30.
C) more than 30 but less than or equal to 40.
D) more than 40 but less than or equal to 50.