The membrane diffusion coefficient (resistance to diffusion by the alveolo-capillary membrane)is estimated by:

A) The DLCOss method
B) Dividing the DLCO by the PaO₂
C) Performing the DLCOsb at two different levels of PAO₂
D) Subtracting F_ACO_T1 from F_ACO_T2 obtained from the DLCOrb