Insurance Policy was purchased for cash on October 1, 2019 for one year by 3600, the required entry at october 1 is? O a. Debit Prepaid insurance 3600 and credit cash 3600. O b. Debit unearned revenue 3600 and credit cash 3600. O c Debit cash 3600 and credit prepaid insurance 3600. O d. Debit Cash 3600 and credit unearned revenue 3600