Which of the Following Statements Are True of Vitamin D

Which of the following statements are true of vitamin D (Select all that apply) ?

A) The stimulus for cutaneous production of vitamin D is the ultraviolet rays of the sun.
B) Cutaneous vitamin D is made from phospholipids stored in the skin.
C) Vitamin D promotes the absorption of calcium by the liver.
D) Vitamin D contributes to efficient immune responses.