Joeys Cafe receives daily shipments of dairy products from Moo Cow Dairy, Inc. The price is $600 per month. Joeys pays six months in advance with a note for $3,600. One month later, Moo Cow sells the note to Second National Bank for $3,100. At the time the note is sold, Moo Cow is

a. an HDC for $3,600. b. an HDC for $3,100. c. an HDC for $600. d. not an HDC.