Grey Corp. sells computers to the public. Grey sold and delivered a computer to West on credit. West executed and delivered to Grey a promissory note for the purchase price and a security agreement covering the computer. West purchased the computer for personal use. Grey did not file a financing statement. Is Grey’s security interest perfected? Yes, because Grey retained ownership of the computer. Yes, because it was perfected at the time of attachment. No, because the computer was a consumer good. No, because Grey failed to file a financing statement.