What must be provided to verify someone's certification status?

To verify someone's certification status, the certification serial number is essential because it uniquely identifies a specific certification holder within the certification body’s records. This number ensures that the verification process accurately reflects the individual's credentials, as different individuals may have similar names or other identifying information. The certification serial number acts as a definitive proof of certification, enabling the organization to confirm authenticity without confusion.

While other information such as the candidate's ID, phone number, or email address can be helpful in managing records or communication, they do not serve the same purpose in verification. The candidate’s ID might help identify the individual but does not specifically relate to the certification status, while phone numbers and email addresses are more useful for contact and cannot uniquely trace certification records. Thus, the certification serial number is the most effective way to verify certification status accurately.