Which of the following is NOT a reason why our 4th-degree auto regressive (AR4) model outperforms the 4-period weighted moving average (WMA4) model?

		AR4 has one more coefficient than WMA4.
		Weights in WMA4 are not optimized while coefficients in AR4 are optimized.
		Weights in WMA4 must sum up to 1 while the sum of coefficients in AR4 can be any value.
		Weights in WMA4 must be between 0 and 1 while coefficients in AR4 can be less than zero or greater than 1.