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?

A.	Cost A is fixed, Cost B is variable.

B.	Cost A is variable, Cost B is fixed.

C.	Both Cost A and Cost B are variable.

D.	Both Cost A and Cost B are fixed.

In describing the cost equation, Y = a + bX, "a" is:

A.	the dependent variable cost.

B.	the independent variable the level of activity.

C.	the total fixed cost.

D.	the variable cost per unit of activity.