Which of the following is NOT an appropriate recommendation regarding dietary supplements? a) People with dark skin who spend little time in the sun may benefit from vitamin D supplements. b) Folate supplements are commonly recommended to women of childbearng age to help prevent birth defects. c) People who eat a high protein, low carbohydrate diet should supplement vitamin B-12. d) People consuming less than 1200 calories per day should take a multivitamin/mineral supplement.