Brett...
I voted the last one, but really, the testimony of the Holy Spirit working within the heart of the people of God is what has determined what the Church is. The Church is the body of Christ, therefore, the Church is all who testify by their words and actions, to the same truth of God's salvation in Christ. That is very broad, but can become specific in a heartbeat. This leaves out quite a few Churches.
The authority of the Church is derived from the Scriptures so it only stands to reason that the true Church has a common testimony of the truth. The true Church lines up with the inscripturated true Church. So whatever the Church says, if it is lawful and in line with the Scriptures, is to be submitted to for all authority.
In Christ,
KC