If a company decides to hire more employees, then its...

a. total variable cost and total cost will increase, but its total fixed cost will not change.

b. total fixed cost will increase, its total variable cost will decrease, and thus its total cost will not change.

c. total cost will increase, and its total fixed cost and total variable cost will decrease.

d. total cost will increase and total fixed cost will decrease, thus its total variable cost will not change.