What is the first, second, and third way to assess the effectiveness of PEEP?
a) First: Auscultation, Second: Observation of chest rise, Third: Oxygen saturation
b) First: Observation of chest rise, Second: Oxygen saturation, Third: Auscultation
c) First: Oxygen saturation, Second: Auscultation, Third: Observation of chest rise
d) First: Oxygen saturation, Second: Observation of chest rise, Third: Auscultation