To Achieve Uniform Density Throughout the Entire Thoracic Vertebrae on an AP

Multiple Choice

To achieve uniform density throughout the entire thoracic vertebrae on an AP thoracic projection,
1) position a wedge-type compensating filter over the upper thoracic vertebrae.
2) use a high-ratio grid.
3) position the patient's feet toward the cathode end of the tube.
4) use a low kVp technique.

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