On July 1, 2013 Meadows Life signed a one year contract with Global Corporation to provide them with maintenance services effective immediately. The monthly service charge is $10,000. Global Corporation paid $20,000 as an advance payment and debited maintenance expense. If the fiscal year ends on December 31 for Global Corporation, the adjusting entry at the end of 2013 would: a. debit maintenance expense, $60,000; credit prepaid maintenance, $20,000; credit maintenance services payable, $40,000 b. debit prepaid maintenance expense, $60,000; credit maintenance expense, $60,000 c. debit maintenance expense, $40,000; credit prepaid maintenance expense, $40,000 d. debit prepaid maintenance expense, $20,000; credit maintenance expense, $20,000 e. debit maintenance expense, $40,000; credit maintenance service payable, $40,000