; BMW 7 series (E65/E66/E67/E68)* Original radio options - InCarTec

There are multiple original radio options in the BMW 7 series (E65/E66/E67/E68)*, 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