Tao receives $10,000 cash in advance for 4 months of legal services on October 1, 2008, and records it by debiting cash and crediting unearned revenue both for $10,000. It is now December 31, 2008, and Tao has provided legal services as planned. What adjusting entry shoould Tao maketo account for the work performed from October 1 through December 31, 2008?