Which wheels should turn when the car is raised freely in the air? on 2001 Audi TT Quattro

I raised my car today to check a squeaking noise, and discovered that if I give it some gas while all 4 wheels are off the ground only the front wheels turn (the rear driveshaft does as well)

I was wondering if that was normal?

Asked by for the 2001 Audi TT Quattro