In the experiment on stimulation of the isolated sciatic nerve, the compound action potential increases in amplitude with an increase in stimulation voltage. This is due to:. a. simultaneous recruitment of small and large diameter axons in the nerve
b. recruitment of small diameter axons followed by large diameter axons in the nerve
c. increase in the size of action potentials produced be each individual axon in the nerve
d. recruitment of large diameter axons followed by small diameter axons in the nerve