I know that GD used a lot of the same technologies from the F-111 to design the F-16. The F-16 has three AOA sensors to provide isolated signals to three seperate Pneumatic Sensor Assemblies, and they in turn vote on the best/most accurate signal to feed to the invidual FLCS computers.
Based on the similarities between the aircraft, this seems most logical, although I admit to know almost nothing about the 'vark.
Also, the AOA probe under the fuselage could be providing other air data inputs besides AOA, or could be used as part of the engine-control scheduling seperate from an air-data computer input. Just guesses though.