A party who filed a security interest in inventory on April 1,
2010, would have a superior interest to which of the following
parties?

(d) The party perfected by filing a security interest in
inventory on April 1, 2010. S/he would therefore have priority
over a judgment lien creditor who filed later on April 15, 2010.
Answer (a) is incorrect because the mechanic’s lien was filed on
March 15 before the perfection of the security interest. Therefore,
the mechanic’s lien has priority over the perfected security
interest. Answer (b) is incorrect because the holder of the purchase
money security interest in after-acquired property filed and
perfected before April 1. Answer (c) is incorrect because a purchaser
in the ordinary course of business is free of other security
interests even if they are perfected before s/he purchases the
inventory.