Martin's Mail Service purchased equipment for $2,500. Martin Paid $500 in cash and signed a note for the balance. Martin debited (increased) the Equipment account, credited (decreased) the Cash account, and:

A. nothing further must be done

B. debited (increased) the Martin, Capital account for $2,000

C. credited (reduced) some other asset account for $2,000

D. credited (increased) a liability account for $2,000