There are multiple original radio options in the Mercedes SL-Class (R230), which option is the original fitted system?

SL (R230) Audio 30 SL (R230) Audio 30
SL (R230) Comand 2.0 D2B SL (R230) Comand 2.0 D2B
SL (R230) Comand APS NTG1 SL (R230) Comand APS NTG1
SL (R230) Comand APS NTG2.5 SL (R230) Comand APS NTG2.5