What constitutes a 'reduced daily rest period', and how many times may a driver take it between any two weekly rest periods?

1. A rest period of at least 9 hours but less than 11 hours, permitted a maximum of three times
2. A rest period of at least 8 hours, permitted twice per week
3. A rest period of at least 7 hours, permitted once per week
4. A rest period of at least 10 hours, permitted four times per week