For an AP Chest Projection Obtained with a Mobile X-Ray

For an AP chest projection obtained with a mobile x-ray unit,
1) the IR is positioned parallel with the midcoronal plane.
2) the image is obtained without the use of a grid.
3) the manubrium is superimposed over the fourth thoracic vertebra.
4) 10 or 11 posterior ribs are demonstrated above the diaphragm.

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