TIME SERIES THERE ARE ONLY 2 SHORT QUESTIONS

(a) Which of the tA,'0 models, and TNt where TNt, CLt, SNt, IRt are trend, cyclical, seasonal and irregular components respec- tively, would you suggest adequately fits the untransformed and log transformed series data? Give a reason(s) for your answer. (3) (b) Which operator(s) of transformation would you apply to this series to make it stationary? (2)