Which of the Following Spirometric Criteria Are Used to Determine

Which of the following spirometric criteria are used to determine the presence of airway obstruction?

A) FEV₁ less than 80% of predicted and FEV₁/FVC less than 80%
B) FEV₁ less than 60% of predicted and FEV₁/FVC less than 60%
C) FEV₁ less than 80% of predicted and FEV₁/FVC less than 65%
D) FEV₁ less than 65% of predicted and FEV₁/FVC less than 80%