please tell me Which of the following statements about production technologies is correct

A. Economies of scale imply that the marginal cost of production decreases as output increases.

B. The network effect is a type of economies of scale.

C. Large scale production is advantageous to the firm if the production technology exhibits economies of scale or increasing returns to scale.

D. Network effects refer to the advantages of combining multiple firms' production technologies together.

Select one:

a.A, B, C

b.A, B, C, D

c.B, C

d.C, D

e.C