An ice cream vendor signs a franchising agreement with the distributor. Under the agreement the distributor agrees to provide ice cream stock with a 10% discount on payment within 30 days, and a 20% discount on payment within 10 days. The distributor allows the operator 90 days to pay for the ice cream stock in full. The above serves as an example of:

A.debt financing.
B.capital budgeting.
C.equity financing.
D.trade credit.
E.loan fronting.