; Mercedes A-Class (1st Gen) W168' Original radio options - InCarTec

There are multiple original radio options in the Mercedes A-Class (1st Gen) W168', which option is the original fitted system?

Enclosed Subwoofers/ Drivers Enclosed Subwoofers/ Drivers
Extra Slim Subwoofers Extra Slim Subwoofers
Spare Wheel Subwoofers Spare Wheel Subwoofers
Underseat Subwoofers Underseat Subwoofers