Canada Manufacturing Co. is using the high-low method to estimate its cost function. The following are the costs and labour hours for the first eight months of the year. Month Labour hours Costs January 3,000 $440 February 4,500 690 March 8,000 510 April 7,000 600 May 6,000 550 June 9,000 980 July 3,500 840 August 5,500 600 Which one of the following represents the highest and lowest respective coordinates of activity level and corresponding total costs? Question 19 options: a) (3,000 hours, $440), (9,000 hours, $980) b) (9,000 hours, $980), (3,000 hours, $440) c) (3,500 hours, $840), (9,000 hours, $980) d) (9,000 hours, $980), (3,500 hours, $840)