Where Is (Are)the Midclavicular Line(s)located

Where is (are) the midclavicular line(s) located?

A) It is an imaginary line on the anterior chest dividing the sternum vertically in half. It is a line descending from the center of the sternum to the umbilicus (navel) .
B) They are two vertical lines on the anterior chest bisecting the collarbones. Each of these lines pass just medial to the nipples.
C) It is a line on the anterior chest descending vertically from the junction of the arm and torso (at the front of the armpit) .
D) They are imaginary lines on the posterior chest bisecting the shoulder blades and descending vertically.