; Mercedes B-Class (1st Gen) W245 Original radio options - InCarTec

There are multiple original radio options in the Mercedes B-Class (1st Gen) W245, which option is the original fitted system?

W169 / W245 Audio 5 W169 / W245 Audio 5
W169 / W245 NTG2.0 W169 / W245 NTG2.0
W169 / W245 NTG2.5 W169 / W245 NTG2.5