An Imaginary Line Connecting the Humeral Epicondyles Is Positioned Perpendicular

Multiple Choice

An imaginary line connecting the humeral epicondyles is positioned perpendicular to the IR for a(n)
1) internally rotated AP shoulder projection.
2) AP oblique shoulder projection (Grashey method) .
3) lateral humeral projection.
4) PA oblique scapular Y shoulder projection.

A) 1 and 3 only
B) 2 and 4 only
C) 3 only
D) 1, 3, and 4 only