Under the UCC Secured Transactions Article, which of the following statements is correct concerning the disposition of collateral by a secured creditor after a debtor's default?a. The collateral may only be disposed of at a public sale.b. The debtor may not redeem the collateral after the default.c. Secured creditors with subordinate claims retain the right to redeem the collateral after the collateral is sold to a third party.d. A good faith purchaser for value and without knowledge of any defects in the sale takes free of any subordinate liens or security interests.