Which of the Following Are Clinical Indicators of Type I

Multiple Choice

Which of the following are clinical indicators of Type I respiratory failure?
1) Decreased PaO₂
2) Increased P(A-a) O₂
3) Decreased PaO₂/FIO₂
4) Decreased ÓS/ÓT

A) 1, 2
B) 2, 4
C) 1, 2, 3
D) 1, 2, 3, 4