Optimal contrast, density, and penetration have been achieved on AP abdominal projections when which anatomic structures are demonstrated?

a. Intestinal gas, diaphragmatic dome, and symphysis pubis
b. Psoas major muscle, kidneys, intestinal gas, and lumbar transverse processes
c. Kidneys, intestinal gas, and intrinsic fat
d. Psoas major muscle, kidneys, inferior ribs, and lumbar transverse processes

D