Assuming a company has a mixed cost structure (i.e., costs include both fixed and variable costs), how will the total per unit cost usually change if the production level decreases?

Group of answer choices

a- It will increase, and in direct proportion to the production decrease.

b- It will decrease, but not in direct proportion to the production decrease.

c- It will increase, but not in direct proportion to the production decrease.

d- It will decrease, and in direct proportion to the production decrease.