You are driving a commercial freight transport truck with a gross vehicle weight rating in excess of 3.5 t. After a driving period of 4 1/2 hours, what is the minimum break you have to take before setting off again?

45 minutes if I have not previously taken a break

30 minutes if I have previously already taken a break of 15 minutes

15 minutes if I have previously already taken three breaks of 10 minutes each