; Audi TT MK1 (8N)* Original radio options - InCarTec

There are multiple original radio options in the Audi TT MK1 (8N)*, which option is the original fitted system?

Audi Chorus (TT) 1997 - Nov 2001 Audi Chorus (TT) 1997 - Nov 2001
Audi Concert II CD (TT) 1997 - Nov 2001 Audi Concert II CD (TT) 1997 - Nov 2001