QUESTION AZ The following regression model studies the effect of time spent in various activities on CEOs' wages. CEOs from a random sample are asked how many hours they spend each week in three activities: working, leisure, and sleeping Any activity is put into one of the three categories, so that for each CEO, the sum of hours in the three activities must be 163. wage = u + lwmk + zfesure + ssleep + 1:. Does this model violate any GaussiMarkov assumption? Select one: Q a. No. the model does not violate anyr Gauss-Markov assumption. O b. The model violates the "no perfect collinearity" assumption. O c. The model violates the "zero conditional mean" assumption. Q d. The model violates the "normal distribution of the error term\" assumption