The most frequent audiometric examination is determination of thresholds of hearing for pure tones, which is conducted:By air conduction as well as...

The most frequent audiometric examination is determination of thresholds of hearing for pure tones, which is conducted:

A.By air conduction as well as by conduction through middle ear.

B.By spatial conduction as well as by bone conduction

C.By air conduction as well as by body conduction

D.By air conduction as well as by bone conduction