Output from which of the following combination of navigational sources provide enough information to the RNAV-equipment to calculate the wind vector?

The output from an Inertial Reference System (IRS) combined with data from an Air Data Computer (ADC) provides sufficient information for RNAV (Area Navigation) equipment to calculate the wind vector effectively.

The IRS supplies precise information about the aircraft's position, velocity, and attitude based on its inertial sensors. It continuously tracks the initial conditions of motion without external references, making it critical for accurate navigation. The ADC complements this by providing essential data regarding airspeed, altitude, and outside air temperature.

By merging the position data from the IRS with the airspeed and heading information from the ADC, the RNAV system can determine the effect of wind on the aircraft's trajectory. This allows the calculation of the wind vector, which is essential for flight planning and efficient navigation. The combination effectively enables the RNAV to assess how the wind is interacting with the aircraft's flight path.

The other combinations would not provide the full set of necessary information for accurate wind vector calculations. Specifically, while inertial systems and GPS may provide position and speed data, without air data inputs, the calculations would lack critical context concerning atmospheric conditions.