The main functions of fat soluble vitamins are:
1. Vitamin E is an important antioxidant.
2. Vitamin A is important in the formation of visual purple.
3. Vitamin D promotes intestinal calcium and phosphate absorption.
4. Vitamin K catalyzes the synthesis of prothrombin.
5. Vitamin A maintains the integrity of mucous membranes.

All of the above.

(1) (2) (3)

(1) (4) (5)

(2) (3) (4)