Question 20 Not yet answered Marked out of 2.00 Flag question Which of the following costs has a variable cost behaviour? 1,840 units 4,700 units 1 Materials $9,200 $23,500 2 Labour $12,880 $42,300 3 Rent $2,000 $4,000 O a. 1 and 2 only O b. 1 only O c. 2 and 3 only O d. All of them