What must be visible to law enforcement personnel while operating a PWC?

The correct answer is the registration numbers, which must be visible to law enforcement personnel while operating a Personal Water Craft (PWC). These numbers act as a unique identifier for the vessel, much like a license plate for a car. They help authorities quickly ascertain information about the PWC, such as ownership and compliance with local registration laws. Having the registration numbers clearly displayed is essential for ensuring safety and accountability on the water.

While other options, such as the operator's license and boat safety equipment, are important for the operation and safety of the PWC, they do not need to be visibly displayed for law enforcement to identify and verify the PWC's registration status. The model number is not relevant to law enforcement's immediate identification of the vessel. Therefore, displaying the registration numbers prominently is crucial for compliance with boating regulations.