Under the Road Transport Working Time rules, what limit normally applies when a mobile worker performs night work?

1. No more than 9 hours of total work between midnight and midday
2. No more than 12 hours on duty if at least 45 minutes is taken as a break
3. No more than 8 hours of driving in each calendar day that includes darkness
4. No more than 10 hours of working time in the relevant 24-hour period