Consider the following model: y = β0 + β1×1 + β2×12+ u (1).

Consider the following model: y = β0 + β1×1 + β2
x1
2+ u (1). Which
of the following statements is correct?
Model (1) is a nonlinear simple regression model.
Model (1) is a linear simple regression model.
Model (1) is a nonlinear multiple regression model.
Model (1) is linear multiple regression model.