If a Category C driver chooses to split their mandatory 45-minute driving break during a 4.5-hour driving shift, how must it be partitioned according to AETR rules?

1. Three equal breaks of 15 minutes each throughout the shift
2. A first break of 20 minutes followed by a second break of 25 minutes
3. A first break of at least 15 minutes followed by a second break of at least 30 minutes
4. A first break of at least 30 minutes followed by a second break of at least 15 minutes