; Mercedes C-Class (2nd Gen) W203 Facelift Original radio options - InCarTec

There are multiple original radio options in the Mercedes C-Class (2nd Gen) W203 Facelift, which option is the original fitted system?

W203 COMAND APS NTG1 W203 COMAND APS NTG1
W203 COMAND APS NTG1 with Harman Kardon W203 COMAND APS NTG1 with Harman Kardon
W203 NTG1 (Audio 50) W203 NTG1 (Audio 50)
W203 NTG2 (Audio 20) W203 NTG2 (Audio 20)