Choice "D" is correct. A sale of the collateral after default to a good faith purchaser destroys subordinate interests in the collateral.
Choice "a" is incorrect. The debtor generally has the right to redeem until the collateral is sold.
Choice "c" is incorrect. A sale of the collateral after default to a good faith purchaser destroys subordinate interests in the collateral.
Choice "b" is incorrect. Both public and private sales are permitted, but in any event the sale must be commercially reasonable.
