Select all the equations that represent a COMPLETE Econometric Model (Classical Linear Regression Model). Models with functional forms are allowed here, as long as ALL the required terms for an econometric models are explicitly determined on the equation. logyi=0+1x1,i+2x1,i2+3x1,i3+uiyi=0+1x1,i+2x2,ilogyi=0+1logx1,ilogyi=0+1x1,i+uilogyi=0+1x1,i1+2x2,i1+vi