The president of a small manufacturing firm is concerned about the continual increase in manufacturing costs over the past several years. The table below provides a time series of the cost per unit for the firm's leading product over the past eight years. YearQuarterCost/Unit ($)YearQuarterCost/Unit ($) 1119.725128.84 217.19232.78 313.74328.44 418.00425.61 2120.536125.79 225.76235.52 323.01326.87 429.94427.96 3123.797128.18 220.29229.02 326.31332.57 425.79427.88 4120.928138.18 228.53228.90 332.86337.44 425.75438.04 (a)Choose the correct time series plot. (i) The line chart shows time series data. The chart has a collection of 32 points connected by linear segments. The coordinates of the points are as follows. (1,19.72), (2,17.19), (3,13.74), (4,18), (5,20.53), (6,25.76), (7,23.01), (8,29.94), (9,23.79), (10,20.29), (11,26.31), (12,25.79), (13,20.92), (14,28.53), (15,32.86), (16,25.75), (17,28.84), (18,32.78), (19,28.44), (20,25.61), (21,25.79), (22,35.52), (23,26.87), (24,27.96), (25,28.18), (26,29.02), (27,32.57), (28,27.88), (29,38.18), (30,28.9), (31,37.44), (32,38.04). (ii) The line chart shows time series data. The chart has a collection of 32 points connected by linear segments. The coordinates of the points are as follows. (1,28.9), (2,37.44), (3,38.18), (4,38.04), (5,27.88), (6,29.02), (7,27.96), (8,28.18), (9,32.57), (10,25.79), (11,35.52), (12,26.87), (13,25.61), (14,28.84), (15,32.78), (16,28.44), (17,20.92), (18,25.75), (19,28.53), (20,32.86), (21,25.79), (22,20.29), (23,26.31), (24,29.94), (25,23.79), (26,25.76), (27,23.01), (28,18), (29,17.19), (30,13.74), (31,19.72), (32,20.53). (iii) The line chart shows time series data. The chart has a collection of 32 points connected by linear segments. The coordinates of the points are as follows. (1,17.19), (2,19.72), (3,18), (4,13.74), (5,20.53), (6,29.94), (7,23.01), (8,25.76), (9,23.79), (10,20.29), (11,25.79), (12,26.31), (13,25.75), (14,28.53), (15