What are the advantages and disadvantages of aggregating deman from a forecasting view? Are there other things that should be considered when going from multiple DC (Distribution Centers) to a DC?

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The number of disk drives (in millions) made at a plant in Taiwan during the past 5 years follows:                                                                                                                                                                         a) Forecast the number of disk drives to be made next year, using linear regression.b) Compute the mean squared error (MSE) when using linear regression.c) Compute the mean absolute percent error {MAPE).

No singal forecast methodology is appropriate under all conditions: True or false?