A licensee whose certificate of completion has been lost shall obtain a duplicate certificate from the _________.

The correct course of action for a licensee who has lost their certificate of completion is to obtain a duplicate certificate from the original provider. This is essential because the original provider is the entity responsible for issuing the certificate and maintaining the necessary records. They can verify the completion of the training and issue a duplicate that reflects the accurate credentials of the individual.

In many cases, the original provider may have specific procedures in place for issuing duplicates, which may involve providing identification or proof of the completion of the course. By obtaining the duplicate from the original provider, the individual ensures that the certification remains valid and recognized as legitimate.

The other choices do not represent the appropriate channels for obtaining a duplicate certificate. The State Board typically deals with licensing issues rather than the issuance of duplicate certificates. A third-party vendor might not have access to the original training records and could lead to discrepancies. Additionally, the instructing school, while potentially relevant, is generally not the original provider responsible for the completion of the training certification.