Explanation:

- Animus attestandi: This is the intent to attest or the intention to bear witness. It is crucial for proving attestation, as the witness must have the conscious intent to verify a document's authenticity.

Correct Answer

- Certiorari: A legal process where a higher court reviews the decision of a lower court. Not related to attestation.

- Falsus in uno, falsus in omnibus: A Latin phrase meaning "false in one thing, false in everything". It deals with credibility in witness testimony, not attestation.

- None of them: Incorrect, as Animus attestandi is relevant.