Which of the Following Statements Are True of the FEF_25-75%

Multiple Choice

Which of the following statements are true of the FEF_25-75%?
I.It is more sensitive to flow coming from medium to small airways.
II.Normal FEF_25-75% for a healthy young adult is approximately 4 to 5 L/sec.
III.It does not have more variance than other measures of flow.
IV.Because the FEF_25-75% is so variable, its validity is questionable.

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