​LL and RA

A) lead I
B) lead II
C) lead III
D) ​aVR
E) ​aVL
F) ​aVF

Lead Arrangement

In electrocardiography, lead arrangement refers to the setup of electrodes on the body to measure the heart's electrical activity from various angles.

Electrodes

Conductive materials or devices used to make electrical contact with a nonmetallic part of a circuit, often found in batteries, electrolysis processes, and medical devices like ECG machines.

ECG

Electrocardiogram, a medical test that measures the electrical activity of the heart to assess heart health and detect abnormalities.