Revenue has a credit balance of OMR 15,000 in Muscat Co. if the closing entry will made at the year end, The entry to close Revenue is: Select one: O a. debit Income Summary OMR15,000, credit Revenue OMR15,000 O b. debit Income Summary OMR20,000, credit Revenue OMR20,000 c. debit Revenue OMR15,000. credit Income Summary OMR15,000. d. debit Revenue OMR15,000, credit Ahmad, Capital OMR15,000