Under the GCOR, the term 'occupying the main track' without authority is prohibited. Which of the following constitutes proper authority to occupy the main track in a non-signaled territory?

1. An oral agreement between the conductor and the engineer
2. A track warrant, Form B, or other written/verbal authority issued by the authorized dispatcher
3. The presence of a clear block on the track circuit indicator in the cab
4. The timetable schedule if the train is running on time