What Position Would Be Most Appropriate to Reduce Pressure Ulcers

What position would be most appropriate to reduce pressure ulcers in a bedridden patient?

A) Directly on his side, with the trochanter bearing the weight
B) Supine, with the sacrum and iliac crest bearing the weight
C) In a semi-Fowler position, with the sacrum and ischium bearing the weight
D) In a lateral position, with body rotated 30 degrees with gluteus bearing the weight