The following is the list of MAD statistics for each of the models you have estimated from time-series data:

Model	MAD
Linear Trend	2.38
Quadratic Trend	3.32
Exponential Trend	4.39
AR(2)	2.71

Based on the MAD criterion, the most appropriate model is

Question 3 options:

	linear trend.
	quadradic trend.
	exponential trend.
	AR(2).