4. (Integrating dummy variables) You fit a purely seasonal model with a full set of standard monthly dummy variables to a monthly series of employee hours worked. Discuss how the estimated dummy variable coefficients , 2, ..., would change if you changed the first dummy variables D = (1,0,0,...) (with all other-dummy variables remaining the same) to A. D = (2,0,0,...) B. D = (-10,0,0,...) C. D" (1,1,0,0...)