What APU is on the A380?

Excuse me, could you please clarify what you mean by "APU" in the context of the A380? Are you referring to a specific component or system within the A380 aircraft? If so, could you possibly elaborate on which APU you're inquiring about, as there may be multiple systems or components that could potentially fall under that acronym? Alternatively, if you're asking about the engine or propulsion system, it's worth noting that the A380 is powered by a pair of Rolls-Royce Trent 900 or Engine Alliance GP7200 engines, depending on the specific variant of the aircraft.