How Did Calvin Ensure Doctrinal Cohesion Among the Clergy Who

How did Calvin ensure doctrinal cohesion among the clergy who taught his theology?

A) He had spies in congregations that reported back to him if any pastors deviated from Calvinist doctrines.
B) He convened regular meetings and synods with all the clerics in larger districts in attendance.
C) He was constantly visiting congregations in Geneva and outside of Switzerland, inspecting the work of Calvinist ministers.
D) He required that pastors maintain journals and other records, which he periodically requested.
E) Since he controlled the funding of all ministries connected to his movement, he could apply tremendous pressure on the clergy to conform.