An AP lumbar projection with accurate positioning demonstrates

1. open intervertebral disk spaces.
2. the vertebral bodies without distortion.
3. the spinous processes aligned with the midline of the vertebral bodies.
4. the sacrum and coccyx aligned with the symphysis pubis.
a. 1 and 2 only
b. 3 and 4 only
c. 1, 3, and 4 only
d. 1, 2, 3, and 4

D