The Model $y = \beta _ { 0 } + \beta _ { 1 } x _ { 1 } + \beta _ { 2 } x _ { 2 } + \beta _ { 3 } x _ { 1 } x _ { 2 }$

Multiple Choice

The model $y = \beta _ { 0 } + \beta _ { 1 } x _ { 1 } + \beta _ { 2 } x _ { 2 } + \beta _ { 3 } x _ { 1 } x _ { 2 }$ + $\varepsilon$ is referred to as a:

A) first-order model with two predictor variables with no interaction.
B) first-order model with two predictor variables with interaction.
C) second-order model with three predictor variables with no interaction.
D) second-order model with three predictor variables with interaction.