Which electrodes are used for Lead II?

Lead II is generated by using electrodes placed on specific locations on the body to measure the electrical activity of the heart as it relates to the inferior portion. To create Lead II, the positive electrode is placed on the left leg (LL), and the negative electrode is placed on the right arm (RA). This configuration effectively captures the electrical impulses traveling through the heart from the right shoulder towards the left foot, allowing for the observation of the heart's rhythmic activity.

This placement is crucial because it establishes the correct vector for Lead II, which is oriented in a specific direction correlating to the typical electrical flow during cardiac cycles. By comparing the potentials between these two points, Lead II provides a unique perspective on the heart's performance, particularly reflecting the activity of the inferior wall of the left ventricle.

The other options do not match the configuration needed for Lead II and therefore cannot yield the same results.