Match the following:

List-I (Cost)	List-II (Formula)
a. Average fixed cost	1. $$\frac{{{\text{Total Fixed Cost}}}}{{{\text{Quantity}}}}$$
b. Average variable cost	2. $$\frac{{{\text{Total Variable Cost}}}}{{{\text{Quantity}}}}$$
c. Average total cost	3. $$\frac{{{\text{Total Cost}}}}{{{\text{Quantity}}}}$$
d. Marginal cost	4. $${\text{Total production}} + {\text{One addition production}}$$

A. a-1, b-4, c-3, d-2

B. a-1, b-2, c-3, d-4

C. a-3, b-1, c-2, d-4

D. a-1, b-3, c-2, d-4

Answer: Option B