On April 1, Rui obtained a mortgage through Primary Lender. On May 1, Rui obtained a second mortgage through Secondary Lender, which recorded its mortgage on the same day. On May 4, Primary Lender recorded its mortgage. On December 1, Rui bought and installed a washer and dryer set through MegaMart and obtained financing for the purchase from MegaMart. MegaMart filed a financing statement on December 15. Who has priority? \ \ a. MegaMart \ \ b. Primary Lender \ \ c. Secondary Lender \ \ d. Rui