Which of following models CANNOT be tranformed into linear regression models:
A. $Y_i = \beta_0 + \beta_1 X_i^2 + u_i$
B. $Y_i = \beta_0 + \beta_1 \ln X_i + u_i$
C. $\ln Y_i = \beta_0 + \beta_1 X_i + u_i$
D. $Y_i = \beta_0 \cdot \exp(\beta_1 X_i + u_i)$
E. $Y_i = \beta_0 + \beta_1 X_i^3 + u_i$
F. $Y_i = \beta_0 + \beta_1 \frac{1}{X_i} + u_i$
A, B, E, and F
E only
A, B, C, and F
D and E Only