What must providers include when training users on an electronic notarization system?

The correct answer emphasizes the importance of providing comprehensive training and written instructions to users of an electronic notarization system. This approach is crucial because it ensures that all users understand the system's operation, including its features, security protocols, and compliance requirements. A course of training allows for hands-on experience and address specific questions or situations that may arise during electronic notarizations.

Written instructions serve as a valuable reference that users can consult even after the training, reinforcing the learning process and helping to avoid potential mistakes. By combining both training and documentation, providers can confidently ensure that users are well-equipped to use the electronic notarization system effectively and securely.

In contrast, the other options suggest either inadequate training or rely solely on one method of communication, which may not meet the diverse needs of all users. Such limited approaches could lead to misunderstandings, errors in notarization, or even legal issues arising from improper use of the electronic system.