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$

$1,000?$ $$10,000$

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$?$

Multiple Choice

Cost A is fixed, Cost B is variable.

Cost A is variable, Cost B is fixed.

Both Cost A and Cost B are variable.

Both Cost A and Cost B are fixed.