Dogwell decides to pay its suppliers more quickly to take advantage of discounts and thus acquire its raw materials for a lower price. Dogwell makes no other changes (e.g., it buys the same volume of raw material). Which of the following ratios would be affected by this decision? (select all that apply)

a. Gross margin

b. Days receivable

c. Effective tax rate

d. SG&A-to-sales

e. Days payable