please answer both!!

Happy Valley, Inc. has received an invoice for $5,500 with forms of 315, 6/45 and uses the net method to record purchases of Happy Valley pays the invoice on the seventeenth day. Accounts Payable will be O credited for 3165 OB dobited for $5,335 ccredited for 35,600 OD. credited for 55,335 Accounting for estimated returns requires that a company make an adjustment for expected refunds: .. O A. at the time of sale or end of period. B. at the end of the period. C. at the time of sale. D. never