THE ANSWER IS ..A ..The Catholic Church.
The name of the official church of the early Christians was of course the Catholic Church, which has never changed its name to this day. From the beginning, the Catholic Church exercised its the authority to define doctrines and morals, to determine which books should make up the Bible, and to preserve that correct interpretation the Holy Bible
http://homepages.paradise.net.nz/mischedj/ct_apolosumm.html (A quick, quick summary of Catholic apologetics)
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