Simi company is considering the nature of cost behavior. Please indicate the true statement about cost behavior is that:

a.

variable costs change on a per-unit basis and change in total as activity changes.

b.

fixed costs are constant on a per-unit basis and change in total as activity changes.

c.

fixed costs are constant on a per-unit basis and constant in total as activity changes.

d.

fixed costs change on a per-unit basis and are constant in total as activity changes.

e.

Some other statement not listed here