For the air-pressure build-up test, what result indicates a defect in the air brake system?

1. Pressure rises from 85 psi to 100 psi in 90 seconds
2. Pressure rises from 85 psi to 100 psi in more than two minutes
3. Pressure begins the test below 80 psi
4. The engine is idling between 600 and 900 rpm