When a Debtor Fails to Pay a Debt,and the Value

When a debtor fails to pay a debt,and the value of the collateral is less than the full amount of the debt,which of the following is generally true?

A) The creditor can obtain a deficiency judgment against the debtor for the amount of the debt that was not satisfied from the collateral.
B) The creditor must absorb the remaining loss and has no further remedy.
C) The creditor must file a bankruptcy proceeding against the debtor in order to obtain further relief.
D) The creditor must record its security interest before proceeding further.