Data for Cost A and Cost B appear below: Units Produced Cost Per Unit Total Cost Cost A 1 ? $ 10 10 ? $ 100 100 ? $ 1,000 $ 10,000 ? 1,000 Cost B 1 $ 5,000 ? 10 $ 500 ? 100 $ 50 ? 1,000 $ 5 ? Which of the above best describes the behavior of Costs A and B? Cost A is variable, Cost B is fixed. Cost A is fixed, Cost B is variable. Both Cost A and Cost B are variable. Both Cost A and Cost B are fixed