What is the typical CAN bus voltage configuration when measuring the High (CAN-H) and Low (CAN-L) lines against ground in a quiescent state (ignition on, no data)?

1. CAN-H sits at 5 Volts, and CAN-L sits at 2.5 Volts
2. Both lines sit at 0 Volts
3. CAN-H sits at 12 Volts, and CAN-L sits at 0 Volts
4. Both lines sit at approximately 2.5 Volts