The anniversary date of a $100,000, 6% bond is June 30. Interest is to be paid twice per year. Entries related to interest are recorded each month. The entry to record the payment of interest on December 31 includes a:

a. debit to interest payable of $2,500; debit to interest expense of $500; credit to cash of $3,000

b. debit to interest expense of $3,000, credit to cash of $3,000

c. credit to cash of $2,500, debit to interest expense of 2,500

d. credit to interest payable of $2,500, debit to interest expense of $2,500