Including an interaction term between two independent variables,X1 and X2,allows for the following except:
A) the interaction term lets the effect on Y of a change in X1 depend on the value of X2.
B) the interaction term coefficient is the effect of a unit increase in X1 and X2 above and beyond the sum of the individual effects of a unit increase in the two variables alone.
C) the interaction term coefficient is the effect of a unit increase in 
.
D) the interaction term lets the effect on Y of a change in X2 depend on the value of X1.
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