How Did Officials Seek to Ensure That Witnesses Gave Truthful

How did officials seek to ensure that witnesses gave truthful testimony?

A) They held the right to charge anyone who gave false testimony with blasphemy and hand them over to church courts.
B) They were required to thoroughly investigate the background of witnesses before accepting their testimony.
C) They took cash or goods from witnesses as a pledge that their testimony was truthful.
D) They appointed the local priest to require witnesses to swear on the church altar as to the truthfulness of their testimony.