Which statements about cost are true?

Total cost is the product of average total cost and the quantity produced.

Total cost is the sum of each short run marginal cost of all units produced.

Average total cost is the sum of average fixed cost and average variable cost.

Average fixed cost is always declining with quantity produced in the short run.

Total cost is always declining with quantity produced.

When is the average total cost minimized?

A. At the first unit produced

B. When the average total cost is equal to the marginal cost

C. When the average fixed cost is equal to the average variable cost

D. When the average variable cost is minimized

F. When the marginal cost is minimized

G. None of the above