For a Lateral Sacral Projection, the

For a lateral sacral projection, the
1) patient's legs are flexed.
2) midcoronal plane is aligned parallel with the imaging table.
3) posterior ribs and the posterior pelvic wings are aligned perpendicular to the imaging table.
4) longitudinal axis of the sacrum is aligned with the short axis of the collimated field.

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