In Which of the Following Types of Ventilation Is Alveolar

In which of the following types of ventilation is alveolar expansion during inspiration due to a decrease in pleural pressure?
1) Positive-pressure ventilation (PPV)
2) Negative-pressure ventilation (NPV)
3) Spontaneous ventilation

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3