Which One of the Following Is the Best Means of Managing

Which one of the following is the best means of managing disbursements from an ethical,business,and economic point of view?

A) Purposely mailing checks without a signature as a means of delaying payment
B) Delaying paying suppliers until 30 days past the due date of each invoice
C) Purposely mailing payments to suppliers from locations that maximize mailing time
D) Taking early payment discounts while paying bills after their due dates
E) Funding your bank account with the minimum amount needed to pay bills in a timely manner