Using the table "Computer Sales Time Series", calculate the mean absolute deviation for a six day moving average. Computer sales time series Week Sales (in thousands) 1 2 2 4 3 5 4 3 5 6 6 7 7 5 8 8 9 4 10 2 11 3 12 5 A) 1.86 B) 2.94 C) 3.89 D) 5.39