When Can Cow's Milk Be Introduced into the Infant's Diet

When can cow's milk be introduced into the infant's diet?

A) Only after the baby has been fed goat's milk for at least six months.
B) Babies should not be given cow's milk.
C) When the baby is consuming at least two-thirds of total daily food energy from a balanced mixture of cereals,vegetables,fruits,and other foods.
D) When the baby is six months old,and then the baby should be given skim milk or 2% milk.