QUESTION 1 You manage a retirement portfolio that typically returns 8% per quarter. What form of trend model would be appropriate for the quarterly time series of portfolio values? O A. Quadratic trend model O B. Linear trend model O C. We do not have enough information to answer this question O D.Log-linear trend model QUESTION 2 Suppose the best time series model for the daily closing values of the Dow Jones Industrial Average is a random walk. This data series covariance stationary. O True O False