; Mercedes E-Class (W211) Original radio options - InCarTec

There are multiple original radio options in the Mercedes E-Class (W211), which option is the original fitted system?

W211/W219 NTG1 Audio 20 W211/W219 NTG1 Audio 20
W211/W219 NTG1 Audio 50 APS W211/W219 NTG1 Audio 50 APS
W211/W219 NTG1 Comand APS W211/W219 NTG1 Comand APS
W211/W219 NTG2.5 Audio 20 W211/W219 NTG2.5 Audio 20
W211/W219 NTG2.5 COMAND APS W211/W219 NTG2.5 COMAND APS