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On October 1. Vista View Company rented warehouse space to a tenant for $2,700 per month. The tenant paid five months' rent in advance on that date, with the lease beginning immediately. The cash receipt was credited to the Unearned Revenue account. The company's annual accounting period ends on December 31. The year-end adjusting entry needed on December 31 is: O Debit Unearned Revenue, $8,100; credit Revenue, $8,100. O Debit Accounts Receivable, $13,500; credit Revenue, $13,500. () Debit Accounts Receivable, $8,100; credit Revenue, $8,100. O Debit Unearned Revenue, $13,500, credit Revenue, $13,500. O Debit Unearned Revenue, $5,400; credit Revenue, $5,400