Which of the following statements is CORRECT?

a. If a firm that sells on terms of net 30 changes its policy to 2/10 net 30, and if no change in sales volume occurs, then the firm's DSO will probably increase.

b. Other things held constant, the higher a firm's days sales outstanding (DSO), the better its credit department.

c. If a firm changed the credit terms offered to its customers from 2/10 net 30 to 2/10 net 60, then its sales should increase, and this should lead to an increase in sales per day, and that should lead to a decrease in the DSO.

d. If a firm sells on terms of net 60, and if its sales are highly seasonal, with a sharp peak in December, then its DSO as it is typically calculated (with sales per day = Sales for past 12 months/365) would probably be lower in January than in July.

e. If a firm sells on terms of 2/10 net 30, and its DSO is 30 days, then the firm probably has some past-due accounts.