Why is the use of positive end-expiratory pressure

Why is the use of positive end-expiratory pressure (PEEP) beneficial when treating mechanically ventilated patients with pneumonia and acute respiratory distress syndrome (ARDS)?

Group of answer choices

PEEP increases alveolar recruitment.

PEEP decreases capillary leakage.

PEEP increases deadspace ventilation.

PEEP decreases intrapulmonary shunt.