One of the requirements of linear regression is homoscedasticity of the residuals. This means that ___________________.
a. The sizes of the differences between the actual values and predicted values for the dependent variable must be about the same for all values of the independent variables.
b. The sizes of the standard deviations for the dependent variable must be about the same for all values of the independent variables.
c. The sizes of the values of the dependent variable must be about the same for all values of the independent variables.