Final answer:
Separation of duties is the personnel control that will allow Lauren to review Danielle and Alex's actions to find any issues.
Step-by-step explanation:
The personnel control that will allow Lauren to review Danielle and Alex's actions to find any issues is Separation of duties. Separation of duties is a control measure that ensures different individuals are responsible for different aspects of a task or process. By separating the duties of Danielle and Alex, Lauren can review their actions independently and identify any fraudulent activities more easily.