You must leave the cab at a stop with passengers still on board. What is required?

1. Leave the engine in gear so the bus cannot roll back
2. Secure the bus (parking brake, doors controlled), and do not leave passengers exposed to movement, traffic or unsupervised door risks
3. Leave the doors fully open and the parking brake off so PRM passengers can board alone
4. Take the ignition keys only if you also hold Code 95