The following data have been collected for four different cost items. $ Cost at Cost at Cost Item 100 units 140 units 10,5 w $ 8,000 60 5,00 X $5,000 $ 0 Y 9,10 $6,500 Z $ 6,700 8,58 0 Which of the following classifications of these cost items by cost behavior is correct? $ A) B) Cost W variable mixed variable mixed Cost X fixed fixed fixed fixed Cost Y mixed variable variable mixed Cost Z variable mixed variable mixed A) Choice A B) Choice B C) Choice C