An optimal AP pelvis projection demonstrates
1. the sacrum and coccyx aligned with the symphysis pubis.
2. the ischial spines aligned with the pelvic brim.
3. a narrow right iliac wing and a wider left iliac wing.
4. a symmetrically appearing obturator foramen.
a. 1 only
b. 1 and 4 only
c. 1, 2, and 4 only
d. 3 and 4 only
C
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