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

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

A) They are imaginary lines on the posterior chest bisecting the shoulder blades and descending vertically.
B) They are vertical lines on the anterior chest bisecting the clavicles. Each of these lines pass just medial to the nipples.
C) It is an imaginary line on the lateral chest extending downward from the center of the armpit.
D) It is an imaginary line on the posterior chest descending along the vertebral column.