What Method(s) Is/are Used to Measure O₂ Consumption

Multiple Choice

What method(s) is/are used to measure O₂ consumption?
1) Fick method
2) Analysis of inspired and expired gases
3) V/Q scans

A) 1 only
B) 1 and 2 only
C) 1 and 3 only
D) 1, 2, and 3