Which of the following are plausible approaches to dealing with a model that exhibits heteroscedasticity?

i) Take logarithms of each of the variables

ii) Use suitably modified standard errors

iii) Use a generalised least squares procedure

iv) Add lagged values of the variables to the regression equation.
(A)(ii) and (iv) only (B)(i) and (iii) only (C)(i), (ii), and (iii) only (D)(i), (ii), (iii), and (iv)
C