What are the five fields displayed on the RMU display areas?

The correct choice highlights the five fields displayed on the Radio Management Unit (RMU) display areas used in the T-6 aircraft. These fields include UHF (Ultra High Frequency), VHF (Very High Frequency), ATC transponder, a blank field for flexibility in display usage, and VHF NAV (VHF Navigation).

Each of these fields serves a crucial function: UHF and VHF facilitate communication across different frequency bands, the ATC transponder is critical for air traffic control interactions by providing identification and altitude information, and the VHF NAV assists pilots in navigation using VHF signals. The inclusion of a blank field allows for adjustments based on operational requirements or pilot preference, ensuring that the necessary information is displayed according to flight needs.

The other options either list fields that are not used in the RMU or include combinations of features that do not accurately represent the five standard fields displayed in the T-6 RMU system. Therefore, the selection representing UHF, VHF, ATC transponder, blank, and VHF NAV provides a comprehensive overview of the functionalities the RMU offers to pilots in managing communications and navigation effectively.