What Is the Primary Difference Between Electromyography (EMG)and Nerve Conduction

What is the primary difference between electromyography (EMG) and nerve conduction velocity (NCV) examination?

A) With EMG testing the electrodes can be placed only in large muscles such as the quadriceps femoris.
B) With NCV testing the electrodes can be placed only in large muscles such as the quadriceps femoris.
C) With EMG testing measurements are taken from an evoked potential versus volitional potentials.
D) With NCV testing measurements are taken from an evoked potential versus volitional potentials.