What Settings on a Conventional Ventilator Are Frequently Adjusted by a Registered

What settings on a Conventional ventilator are frequently adjusted by a registered respiratory therapist when managing the pulmonary Complications of necrotizing enteroColitis
I.Increase in positive end-expiratory pressure
II.Increase in peak airway pressure
III.Decrease in positive end-expiratory pressure
IV.Decrease in peak airway resistance pressure

A) I and IV
B) II and III
C) I and II
D) II and IV