; BMW 1 series (E81/E82/E87/E88) Original radio options - InCarTec

There are multiple original radio options in the BMW 1 series (E81/E82/E87/E88), 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