Which of the following is NOT a method to prove training?

Discussing training verbally is not a tangible method to prove that training has occurred. While verbal discussions can provide insight and share information about training topics, they do not offer concrete evidence or documentation that backs up the claim of having undergone specific training.

On the other hand, showing a certificate of completion, referencing an internal training database, and providing a training agenda all serve as formal methods to validate and document training. Certificates provide proof of completion from training sessions or courses, internal training databases offer a systematic record of completed training, and a training agenda outlines the content covered and serves as a structured reference for what participants were trained on. Thus, these options create a reliable foundation for demonstrating compliance with training requirements, while verbal discussions lack the same level of accountability and verifiability.