Which positioning problem(s) listed result(s) in an AP-PA chest projection (lateral decubitus position) with the manubrium and the fifth thoracic vertebra located at the same level?
1) A patient rotated into an RPO position
2) An AP projection obtained with the upper midcoronal plane tilted away from the IR
3) A PA projection obtained with the upper midcoronal plane tilted toward the IR
4) An AP projection obtained with the central ray angled cephalically
a) 1 only
b) 2 only
c) 2 and 3 only
d) 2, 3 and 4 only