Which of the following must a PPO display on their vehicle?

A Private Patrol Operator (PPO) must display the company name on their vehicle as a requirement for identification and professionalism in the private security industry. This ensures that the public can easily recognize the security service being provided and promotes accountability among the personnel operating the vehicle. The presence of the company name also helps to establish the legitimacy of the security service to clients, bystanders, and law enforcement.

Displaying the company name aids in creating a clear connection between the vehicle and the security company it represents, which is vital for transparency in security operations. This requirement aligns with regulations in the California Private Security Services Act, which emphasizes the importance of identification in maintaining public trust and order.

While other options might seem plausible, none meet the legal requirements set forth for private security vehicles. Personal phone numbers, license plates alone, or the owner's name would not provide the necessary public identification of the security service provider.