Final answer:
Passengers are not approved for ATC voice communications with an operational ACARS system, which is intended for use by flight crews and airline operational centers.
Step-by-step explanation:
With an operational ACARS (Aircraft Communications Addressing and Reporting System), the type of ATC (Air Traffic Control) voice communication not approved is for passengers. ACARS is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The system enables the flight crew and airline operational centers to send messages back and forth.
However, despite its capabilities, ACARS is not meant for passenger communication with ATC. Thus, of the options provided, passengers are not approved for ATC voice communications using an operational ACARS system.