Suppose that the value of $R^2$ for an estimated regression model is exactly zero. Which of the following are true?

i) All coefficient estimates on the slopes will be zero

ii) The fitted line will be horizontal with respect to all of the explanatory variables

iii) The regression line has not explained any of the variability of y about its mean value

iv) The intercept coefficient estimate must be zero.
(A)(ii) and (iv) only (B)(i) and (iii) only (C)(i), (ii), and (iii) only (D)(i), (ii), (iii), and (iv)
C