The actual demand for mobile phones for XYZ store is as follows:

Period Value
1 19
2 20
3 18
4 19
5 17
The store manager is trying to forecast for the next period. He decided to use a 3-period moving average and weighted average forecast using weights of 0.5, 0.3, and 0.2 respectively. Which forecasting technique is preferable to be used in the next period using the MAD?

a) The three-period moving average is by far much preferable than the weighted average.
b) The weighted average technique is by far better than the moving average.
c) The two techniques are almost the same.
d) Both techniques are not appropriate.