An AP Chest Projection Obtained with the Patient Rotated into an RPO

An AP chest projection obtained with the patient rotated into an RPO position demonstrates
1) the left SC joint superimposed over the vertebral column.
2) the left posterior ribs with greater length than the right posterior ribs.
3) a manubrium superimposed over the fourth thoracic vertebra.
4) elevated lateral clavicular ends.

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