Use CHECKPOINT to answer the following questions: a. What are the principal primary sources? b. What are the principal secondary sources? a. The principal primary sources include: (Select all that apply.) O A. Federal Tax Cases OC. IRS Rulings and Releases E. IRS Publications G. Treasury Regulations Federal Tax Coordinator B. Warren, Gorham and Lamont journals and treatises OD. U.S. Tax Treaties in Force F. Master Tax Guide OH. Committee Reports J. Internal Revenue Code