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Question 9 What do you think about the possibility of applying the OLS model? Which of the following models is suitable for the OLS analysis? O m) only () An AR (1) (1) An ARMA (20) (1) An MA (1) (iv) An ARMA (1.1) O () and (ii) only O Q). (1), and (iin) only O (), (1), (1i), and (iv)