When preparing to obtain a 12-lead ECG, the “LL” and “RL” electrodes should be placed: Select

When preparing to obtain a 12-lead ECG, the “LL” and “RL” electrodes should be placed: Select one:
A. anywhere on the arms.
B. on the lower abdomen.
C. on either side of the chest.
D. on the thighs or ankles.