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?

a. Yes, because Grey retained ownership of the computer.

b. Yes, because it was perfected at the time of attachment.

c. No, because the computer was a consumer good.

d. No, because Grey failed to file a financing statement.