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All three could cause it.
It could be a couple things, if it is a stock turbo? It could be damaged( compressor/turbine wheel). If it spins freely and no visible damage, you would need to check for exhaust and compressor piping for leaks. If it is an aftermarket turbo or turbo installed on an engine that didn't come with one. Other than the causes above, the turbo or turbine housing is too large and their isn't enough exhaust volume to spool the turbo up in your operating rpm range.
Audi usually buy their turbochargers from Borg-Warner.
The Bugatti Veyron has 4 turbochargers
An inoperative radiator fan is likely.An inoperative radiator fan is likely.
Most common turbochargers (bearings) are lubricated and cooled with engine oil.
A malfunction in the range sensor could cause the cruise to be inoperative.A malfunction in the range sensor could cause the cruise to be inoperative.
Inoperative statements is a euphemism for lies.
Turbochargers turn too fast for ball bearings. Sleeve bearings are typically used in this application.
The likely word is "imperative" (immediately necessary).ANS 2 - Or it could be 'inoperative', -not working.
There Are 4
If both are inoperative check the fuse, and the brake light switch.