How should the interior central rear-view mirror (espelho retrovisor interior) be properly adjusted?

1. Frame the entire rear window squarely within the mirror frame by holding the mirror edges without touching the glass, from your normal seated driving position
2. Angle it upwards to check the backseat passenger facial expressions
3. Angle it to the left to eliminate the driver's side blind spot completely
4. Adjust it while driving at 60 km/h on an urban avenue