; Audi A6 2nd Gen (C5/4B) Original radio options - InCarTec

There are multiple original radio options in the Audi A6 2nd Gen (C5/4B), which option is the original fitted system?

Audi A6 Navi Plus RNS-D Audi A6 Navi Plus RNS-D
Audi A6 Navi Plus RNS-D BOSE Audi A6 Navi Plus RNS-D BOSE
Audi A6 Navi Plus RNS-E Audi A6 Navi Plus RNS-E
Audi A6 Navi Plus RNS-E BOSE Audi A6 Navi Plus RNS-E BOSE
Audi A6 Symphony II BOSE Audi A6 Symphony II BOSE
Audi Concert Audi Concert
Audi Concert BOSE Audi Concert BOSE
Audi Concert I CD BOSE Audi Concert I CD BOSE
Audi Concert II CD Audi Concert II CD