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OC Music Company has been in business for 4 years. Data about the sales of each quarter were collected below. The manager wants use these data to forecast sales of the 5th year. (a) Develop a regression model for trend and seasonality. How many indepenpent variables do you have in your regression? (b) How much of the variations in sample value of dependent variable does the developed regression model for trend and seasonality explain? Do not use percentage. Rounded to two decimal places. For example, if the value from the excel output is 0.7896, you should type 0.79 in the box. (c) Use the developed regression model for trend and seasonality to forecast for sales of the first quarter in the 5th year. Round your answer to two decimal places. (D) What is the MSE for this time series forecast when using the developed model for trend and seasonality? Round your answer to two decimal places