A company manufactures a line of twelve items. Their usage and unite cost with the annual dollar usage are shown in the parenthesis (part #, unit usage, unit cost $): (1, 1100, $2), (2, 1100, $60), (3, 200, $4), (4, 700, $1), (5, 100, $3), (6, 30, $25), (7, 300, $22), (8, 1500, $10), (9, 900, $2), (10, 500, $12), (11, 1500, $40), (12, 600, $8). Which part is classified category B? A company manufactures a line of twelve items. Their usage and unite cost with the annual dollar usage are shown in the parenthesis (part #, unit usage, unit cost $): (1, 1100, $2), (2, 1100, $60), (3, 200, $4), (4, 700, $1), (5, 100, $3), (6, 30, $25), (7, 300, $22), (8, 1500, $10), (9, 900, $2), (10, 500, $12), (11, 1500, $40), (12, 600, $8). Which part is classified category B? 9 and 10 7 and 8 5 and 6 3 and 4 1 and 2