Martha loaned $40,000 to Suzanne and, as security for the repayment of the loan, Martha took a security interest in all of Suzanne's inventory and equipment. Suzanne has now defaulted on her third loan payment to Martha. Assuming Suzanne has no other creditors, which of the following must have occurred in order for Martha to seize Suzanne's inventory: O A. Martha must have successfully sued Suzanne. O B. Garnishment. O C. Attachment. O D. Subordination