What were the four standards used by the Bishops of the Church to discern which of the books include the Canon of the Bible?

There was only one standard used, the Apostolic Tradition and those books which had been read in Church. The Old Testament was the accepted Septuagint (Greek) translation of the Old Testament, and the New Testament were the books commonly used by every Christian Church in the world, most especially at Rome. They were confirmed at the Council of Rome, and the decree of Pope Damasus I in 392 A.D. His decision was confirmed by several Ecumenical Councils: Council of Hippo 393 A.D., Third Council of Carthage 397 A.D., Fourth Council of Carthage in 419 A.D., Council of Florence 1431-1445 A.D., and finally The Council of Trent 1546-1565.