What key factor must be established for entering Vehicle or License Plate data into a PERSON record?

The key factor for entering Vehicle or License Plate data into a PERSON record is the reasonable grounds to believe that the subject may be operating the vehicle. This requirement is crucial because it ensures that there is a legitimate basis for linking a person to a specific vehicle or license plate.

Establishing reasonable grounds protects the integrity of the data entry process by ensuring that law enforcement or data personnel have sufficient evidence or rationale indicating the connection between the individual and the vehicle in question. This connection is essential for effective tracking and management of data related to potential violations or criminal activities.

The other options involve different forms of evidence or verification that may not be directly linked to establishing a logical connection between a person and a vehicle. Thus, they do not fulfill the necessary requirement needed for data entry in this context.