In a decomposition model, the main theoretical difference between the deseasonalised data (DS) and the centred moving average (CMA) is Select one: O a. DS includes a trend component whereas CMA doesn't have a trend component O b. DS includes a cycle component whereas CMA doesn't have a cycle component O c. DS includes a random component whereas CMA doesn't have a random component O d. CMA contains a seasonal component whereas DS does not include a seasonal component. O e. None of the above