K Metro Event Planning Services collects fees from its customers in advance. On January 1 of the current year, the balance of its Unearned Revenue account was $4,000 (CR). During January and February, the company collected $2,700 and $900 as advance fees. During the two-month period, it performed services of $5,100 related to the deferred revenue. What is the balance in Unearned Revenue at the end of February? OA. credit balance of $4,000 OB. credit balance of $2,500 OC. debit balance of $2,500 OD. debit balance of $4,000 0