What must be permanently marked on a personnel platform?

The correct choice indicates that the weight of the platform and its rated load capacity must be permanently marked on a personnel platform. This requirement is crucial for ensuring the safety of personnel utilizing the platform during operations. By having the weight and capacity clearly marked, it provides operators and users with essential information needed to avoid overloading the platform, which could lead to structural failure or accidents.

Marking the platform with its rated load capacity helps to ensure compliance with regulatory standards, promotes safe work practices, and assists in effective planning for lifting operations. Knowing how much weight the platform can safely support allows for better management of resources and personnel, ultimately contributing to a safer work environment.

The other options, while important, do not address the critical aspects of weight and capacity directly related to the integrity and safety of the platform itself. Color coding for load limits, names of authorized personnel, and inspection dates serve different functions in terms of safety and compliance but are not as directly relevant to the operational limits imposed by the platform's weight and capacity.