For each of the following transactions for the Sky Blue Corporation, prepare the adjusting journal entries required on October 31. (If no entry is required for a transaction/event, select "No Journal Entry Required" in the first account field.) a. Collected $3,750 rent for the period October 1 to December 31, which was credited to Unearned Revenue on October 1. b. Paid $2,280 for a two-year insurance premium on October 1 and debited Prepaid Insurance for that amount. c. Used a machine purchased on October 1 for $53,400. The company estimates annual depreciation of $5,340.