Auditors do not accept good intentions. Evidence is a signed pack that maps your real AI activity to the controls each framework asks for. One export, timestamped and attributed to a person, gathered every day instead of reconstructed the week before the audit.
The same signed evidence maps to every framework below. Start with the one your customers or regulators are pushing on.
Evidence does not replace your GRC platform. It supplies the AI evidence layer those platforms have been missing, and streams the same events into your SIEM.