A company had demand for 500 bicycles in January, and forecasted a demand in February for 500 bicycles. The next forecast was for March's demand of 800 bicycles and April's demand of 1000 demand was 900. It is most useful for products or items that have a very stable/flat trend such as mature products, or for use in comparison to other, more sophisticated. List and explain your answer of which time series models were involved including the exhibit above