You are checking the two-second safety distance and have started to count when the vehicle in front has passed a prominent point with the trunk . When can you reach the prominent point ?
When I have counted '21, 22 ', I am allowed to reach that point with the front bumper
When I've counted '21, 22 ', I'm allowed to reach that point with the trunk
Only when the vehicle in front has reached the next striking point
Only when the vehicle in front is at least the stopping distance away from the prominent point