The following residual-versus-predicted scatterplot was produced after fitting a simple linear regression of Y on X: O O -10 0 10 20 o model$residuals -30 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 modelSfitted.values Comment on the assumptions of this regression model using this plot. A) The assumptions of linearity and constant variance are both violated. B) The assumption of linearity is violated while constant variance is satisfied. C) The assumption of linearity is satisfied while constant variance is violated. D) The assumptions of linearity and constant variance are both satisfied