A baby is born at 30 weeks of gestation by cesarian delivery Neonate develops tachypnea, flaring, subcostal and intercostal retractions immediately after birth. Chest radiography shows bilateral, diffuse, ground glass appearance and air - bronchogram sign present. Doctor started surfactant therapy within 1 hour of onset of respiratory distress. This is known as_____
Immediate therapy
Late rescue therapy
Early rescue therapy
Prophylactic therapy