Credit Extender, Inc. (CE), a creditor, wants to perfect its security interest in collateral owned by Dandy Goods, Inc. (DG). The most common way to perfect a security interest is to O file for a writ of attachment after the debtor has defaulted. O do nothing: all security interests automatically perfect upon attachment. O foreclose on the collateral after the debtor has defaulted. O file a financing statement with the appropriate state or county official.