Tao Co. receives $10,000 cash in advance for 4 months of legal services on October 1, 2013, and records it by debiting Cash and crediting Unearned Revenue both for $10,000. It is now December 31, 2013, and Tao has provided legal services as planned. What adjusting entry should Tao make to account for the work performed from October 1 through December 31, 2013?