Explanation:

* Create PDF: In the context of a medical specialist completing their review of an insurance claim, the automation likely involves generating a formal document, such as a report, which can then be attached to the case. In Pega, this is typically accomplished through a PDF generation functionality, which converts the review findings into a document that can be attached to the case.
* Send email: Employees receiving confirmation upon registration is typically handled via automated email notifications. When an employee registers for certification classes, an automated email would serve as a confirmation for the registration. This is a common practice in business process management systems to confirm and communicate actions.
* Push notification: A Fraud department manager receiving a notification about an approval request in their worklist is a scenario suited for push notifications. These are immediate alerts that can be sent to a user's mobile device or computer, prompting them to take action or informing them of an important event.
* Change to a stage: If an approver rejects an expense report, allowing the employee to modify and resend it for approval would involve workflow automation. This typically means that the case needs to be moved back to a previous stage in the process where the employee can make the necessary changes before resubmitting it for approval.
References:
* These use cases are aligned with the automation capabilities of Pega's BPM (Business Process Management) tools, which are designed to handle such scenarios.
* The Pega Platform documentation and help resources provide guidance on configuring these types of automations within the case management framework.