The following data have been collected for four different cost (bens Cost Cost at 100 Cost at Item units 140 units W $8,000 $10,560 X $5,000 $5,000 Y $6,500 $ 9,100 Z $6,700 $ 8,580 Cost W Cost X Which of the following classifications of these cost items by cost behavior is correct? Cost Y A) variable fixed mixed Cost Z variable B) mixed fixed variable C) variable fixed variable mixed variable D) mixed fixed mixed mixed